A marketplace advertising audit often starts with the wrong promise: “we will find wasted spend.” Useful, yes. But for an ecommerce brand spending from roughly €5K per month on Amazon, bol.com and MediaMarkt, wasted spend is only the visible leak. The more expensive leak is ad spend that looks acceptable in the platform while quietly ignoring SKU margin, stock cover, retail fees and channel priority.
The named mistake I see is the cleanup audit. An agency downloads the Amazon search term report, adds negatives, lowers bids on high-ACOS keywords, tidies campaign names and sends a smart-looking spreadsheet. Everyone feels productive. Two weeks later, the account is still scaling a low-margin variant, bol discovery campaigns are stealing budget from a better LVB product, and MediaMarkt retail media is pushing an electronics bundle that will be out of stock before the next purchase order lands.
My stance: a marketplace advertising audit should not be a hygiene exercise. It should be a profit review with decision rights. The audit must answer one uncomfortable question before anyone optimizes bids: which products are commercially allowed to receive more spend today?
This guide is written for brands in the Netherlands and Belgium using an Advertentie Service partner for marketplace ad management across Amazon, bol and MediaMarkt. At €5K monthly spend, you do not need a 75-point checklist that treats every issue equally. You need an audit that ranks decisions by margin impact, stock risk and marketplace role.
What the current audit advice gets right
The strongest Amazon PPC audit guides are not useless. They cover important operator work. Adverio’s checklist starts with date ranges, break-even ACOS, campaign naming, campaign type distribution, overlap, match types, bids, budget utilization, conversion rates and negative keywords. AdLabs covers total sales performance, placements, bid management, search terms, tactic allocation, campaign structure, targeting mix, budgets, ad types and dayparting. Marknology widens the audit beyond ads into listing quality, PPC health, keyword rank, account health, pricing, Buy Box, inventory, fulfilment and competitor gaps. Optmyzr focuses on wasted spend, expensive queries, non-converting products, budget pacing, campaign structure and the danger of reacting too slowly.
That is good advice. If your Sponsored Products campaigns are full of broad-match junk, duplicated exact targets and daily budgets that die before lunch, you absolutely should fix that. If your listings have weak images or a conversion rate problem, more bid work will not save the account. If a previous agency left a messy campaign architecture, the audit should document it.
But most audit content still treats the ad account as the centre of the business. That is the gap FiveX can own. In marketplace advertising, the ad account is not the centre. The SKU P&L is the centre. The ad account is only one way money enters and leaves it.
The angle most competitors miss: audit permission, not performance
A normal PPC audit asks, “Which campaigns perform well?” A better marketplace advertising audit asks, “Which campaigns are allowed to perform?”
That sounds subtle, but it changes the work. A campaign with 22% ACOS may be excellent for a product with 48% contribution margin and 45 days of stock. The same 22% ACOS may be a problem for a product with 19% contribution margin, a 9% return rate and only twelve days of cover. Platform performance is not enough. You need permission from the commercial model.
I like to split the audit into three ledgers:
- The spend ledger: where did budget go, which searches triggered ads, which placements received bids and which campaigns ran out of money?
- The profit ledger: what is the SKU’s break-even ACOS after COGS, marketplace fees, fulfilment, returns, agency fee allocation and VAT handling?
- The operating ledger: can the business actually support more demand with enough stock, Buy Box eligibility, price position, delivery promise and marketplace priority?
Only when all three ledgers agree should a campaign move from “fix” to “scale”. This is where FiveX’s profitability dashboards and marketplace analytics matter: the audit should not rely on one Amazon export, one bol Ads report and one finance spreadsheet that nobody reconciled. It should connect campaign data to product contribution margin and operational reality.
Step 1: build the SKU permission table before touching bids
Before you lower a single bid, create a SKU permission table. This is the audit’s control document. For every advertised SKU or product family, capture selling price, COGS, marketplace commission, fulfilment cost, expected returns, current ad spend, attributed revenue, stock cover, Buy Box or offer status, and current price position.
Then assign one of four labels:
- PROTECT: profitable, important and already converting. Keep coverage on branded, defensive and high-intent terms.
- GROW: profitable with stock and conversion evidence. Eligible for more budget.
- LEARN: strategically useful but not yet proven. Give it strict test budgets and evidence rules.
- FIX: weak margin, poor conversion, stock risk or price problem. Do not solve this with higher bids.
Named example 1: Daan’s coffee machine accessory kit. The Amazon.nl campaign shows €1,800 spend, €7,200 attributed sales and 25% ACOS. A cleanup audit might call that acceptable. The permission table says otherwise: the kit sells for €39.95, has €14.80 COGS, €6.10 combined marketplace and fulfilment cost, 8% expected returns and €3.20 average return handling. Break-even ACOS is around 21%. Stock cover is eighteen days. Verdict: FIX, not GROW. The right move is to cap generic discovery, protect branded terms, and move budget toward the higher-margin replacement-filter bundle.
This is also where a FiveX product hook naturally belongs. FiveX can show SKU-level contribution margin beside ad performance, so the audit can stop arguing about whether 25% ACOS “looks fine” and start deciding whether the product can actually afford it.
Step 2: audit campaign roles instead of campaign names
Clean naming conventions are helpful. They are not strategy. A marketplace advertising audit should identify what job each campaign is doing. I use five roles:
- Defence: brand terms, own ASIN/product targeting and high-intent repeat demand.
- Harvest: exact targets with proven conversion and margin permission.
- Discovery: broad, auto or category exploration with strict waste limits.
- Launch: temporary support for a new SKU or marketplace launch.
- Clearance: controlled spend to move stock without pretending it is profitable growth.
The audit should flag campaigns where the role and budget do not match. Discovery campaigns should not have unlimited budget just because they find search terms. Defence campaigns should not be starved because their ACOS looks “too easy”. Clearance campaigns should not be reported as proof that the agency is growing the brand.
Named example 2: Sofie’s bol LVB lunchbox line. bol Sponsored Products shows a neat 3.8 ROAS on a broad campaign for “broodtrommel kinderen”. The campaign receives €900 of a €2,500 monthly bol budget. But the audit finds that 64% of spend lands on a low-margin colour variant selling at €12.99, while the better LVB hero set sells at €18.95 with €5.40 more contribution margin per order. The role is wrong. That campaign is not discovery anymore; it is accidental scaling of the worst variant. Verdict: split variants, protect the hero set, cap the low-margin colour and let FiveX advertising automation push new search terms only when SKU permission is green.
Step 3: separate wasted spend from expensive learning
One of the laziest audit recommendations is “pause all targets with high ACOS.” Sometimes that is correct. Sometimes it kills the only learning that could open a profitable lane.
Use three buckets:
- True waste: irrelevant queries, clicks on unavailable products, targets above break-even with enough data and no strategic reason.
- Expensive learning: relevant but early targets that need a capped test, better listing evidence or a narrower match type.
- Strategic loss: spend that is intentionally unprofitable for a limited period, such as launch support or competitor conquesting, and must be approved explicitly.
The important part is evidence. “We are investing in learning” is not a magic sentence that makes bad spend smart. The audit should define the test budget, the required conversion signal and the stop date. For example: allow €250 on a new Amazon generic keyword cluster only if the advertised SKU has at least 35% contribution margin, twenty-one days of stock and a review rating above 4.2. If it reaches fifteen clicks without add-to-cart or forty clicks without an order, move it to negative or bid down hard.
Step 4: audit marketplace mix, not just Amazon
Most PPC audits are Amazon-heavy because Amazon data is rich and exportable. That is understandable, but dangerous for a brand selling across NL/BE marketplaces. If Amazon receives all the audit attention, bol and MediaMarkt become budget afterthoughts. Then the business optimizes the channel with the loudest reports instead of the channel with the best profit capacity.
Named example 3: Milan’s refurbished speaker bundle. Amazon.de reports a 31% ACOS on a €1,600 monthly campaign. MediaMarkt Marketplace reports only €450 spend and a less polished dashboard, but the same bundle has €11.60 higher contribution margin there because of price position and lower return handling. bol.com sits in the middle with stronger volume but thinner margin. A platform-only audit would reduce Amazon bids and call it a day. A marketplace audit moves €500 from Amazon generic discovery into MediaMarkt Sponsored Product tests, keeps bol defence live, and asks operations to reserve thirty units for MediaMarkt before scaling.
This is exactly the kind of cross-marketplace decision FiveX is built for. Marketplace analytics, inventory insights and AI recommendations can turn a weekly audit from “what happened in each platform?” into “where should the next euro go?”
Step 5: include agency operating behaviour in the audit
If you use an Advertentie Service partner, audit the operating model as well as the campaigns. Good agencies do not just optimize. They make decisions visible.
Ask for five things:
- A weekly change log showing bids, budgets, negatives and campaign launches.
- A reason code for every major budget move: margin, stock, search term evidence, ranking goal, launch or clearance.
- A SKU permission view that finance and ecommerce both understand.
- A test register with start date, budget cap, success metric and stop rule.
- A marketplace allocation note explaining why Amazon, bol and MediaMarkt each deserve their current spend.
If the agency can only explain performance after the fact, the account is being managed reactively. If it can show decision rules before spend moves, you have a real operating system.
The 90-minute audit agenda for a €5K account
You do not need a month-long consulting project to start. Use this agenda for the first audit session:
- Minutes 0-15: agree the business goal. Profit growth, market entry, stock clearance and ranking support require different rules.
- Minutes 15-35: review the top twenty advertised SKUs by spend and assign PROTECT, GROW, LEARN or FIX.
- Minutes 35-55: map campaign roles and identify role-budget mismatches.
- Minutes 55-70: split targets into true waste, expensive learning and strategic loss.
- Minutes 70-85: reallocate budget across Amazon, bol and MediaMarkt based on profit capacity and stock cover.
- Minutes 85-90: agree the next seven-day change log and the one metric that would change the decision.
The output should be small enough to act on. A good audit does not produce fifty recommendations. It produces five decisions the team can execute this week.
What good looks like after the audit
After a proper marketplace advertising audit, you should know which spend is protected, which spend is capped, which spend is paused and which spend is waiting for stock or margin permission. You should also know which decisions belong to the agency, which belong to ecommerce, and which need finance input.
The dashboard should change too. Instead of showing only spend, sales, ROAS and ACOS, it should show contribution margin after ads, TACoS by product family, stock cover, campaign role, marketplace allocation and action status. That is how FiveX helps an Advertentie Service relationship become operationally useful: profitability dashboards for the CFO, advertising automation for the operator, inventory insights for the planner and AI recommendations for the next best budget move.
Final thought: audits should create courage, not theatre
The best marketplace advertising audit gives the team courage to make sharper decisions. It becomes easier to cut a campaign that looks good but sells the wrong SKU. It becomes easier to fund a MediaMarkt test when Amazon has louder data but weaker margin. It becomes easier to tell an agency, “do not optimize this yet; the product does not have permission.”
That is the trade-off. A cleanup audit makes the account tidier. A profit review makes the business harder to fool. Choose the second one.