After managing hundreds of brands on Amazon, we’ll tell you something most agencies won’t: sometimes the account is stuck and it isn’t the agency’s fault. We’ve taken over accounts where the previous agency got fired for “bad results,” dug in, and found a competent team that was set up to fail by the seller.
That’s uncomfortable, because the agency-critique genre is built on the opposite story — the junior account manager with 25 accounts, the senior strategist who never touches your listing, the survivorship-bias case studies. All real. But there’s a second failure mode nobody writes about: the seller mistakes that make even a good agency underperform. If you’ve cycled through two or three agencies and the results never change, the common denominator might be on your side of the table.
Here are the six we see most, and what good operators do instead.
1. Hiring an Agency and Going Dark
The most expensive mistake, and the most common. The seller signs, hands over access, and disappears — no product roadmap, no margin targets, no answers to the agency’s questions for weeks. Then they resurface at month three furious that ACOS drifted.
Amazon is not a set-and-forget channel, and neither is an agency relationship. Your agency knows advertising and listings. You know your true landed cost, your inventory position, your supplier lead times, and which SKUs you actually want to push. When you go dark, the agency optimizes toward the only goal it can see — usually revenue or a blended ACOS number — because you never gave it a contribution-margin target to aim at.
What good operators do: a 30-minute monthly call minimum, a shared doc with current per-unit economics, and a 24-hour response time on agency questions. The accounts that compound are the ones where the operator treats the agency as a partner with information asymmetry to close, not a vendor to outsource thinking to.
2. Demanding a Blended ACOS Number and Nothing Else
If the only number you ask for is “what’s our ACOS this month,” you’re training your agency to manage the wrong thing. Blended ACOS hides everything that matters: branded vs. non-branded split, which campaigns are buying profitable incremental sales vs. cannibalizing organic, placement-level waste, and TACoS drift.
We’ve audited accounts where a “healthy” 24% blended ACOS was hiding a branded-defense campaign converting at 8% ACOS subsidizing a discovery campaign burning at 70%. The blended number looked fine. The brand was lighting money on fire in one corner and calling it a good month.
What good operators do: ask for ACOS and TACoS, branded vs. non-branded broken out, and — the number that’s actually yours — contribution margin after all Amazon fees and ad spend. Revenue is vanity when the platform takes close to half. Make your agency report on the number you keep.
3. Starving the Creative and Then Blaming the Ads
This is the one we see most as a creative-led agency, and it’s the most fixable. The seller pours budget into PPC, the ads drive plenty of clicks, and conversion is mediocre — so the seller concludes “the ads aren’t working” and pressures the agency to cut spend.
The ads were working. They sent qualified traffic to a listing that doesn’t close. A hero image that doesn’t communicate the product at thumbnail, an A+ section designed for desktop on a 70%-mobile audience, a slot-2 image that wastes the scroll-back — these cap your conversion rate, and no amount of bid optimization fixes a page that can’t convert. You’re paying for clicks that bounce and then blaming the click.
PPC and creative are the same system. A 1-point CVR improvement does more for ACOS than weeks of bid tuning, because it lowers your effective cost-per-acquisition on every click, paid and organic. Sellers who silo “ads” and “creative” into separate budgets — and starve the creative — sabotage both.
What good operators do: fund creative testing as part of the advertising budget, not as a separate nice-to-have. Treat hero image and listing conversion as the foundation the ad spend sits on.
4. Changing Strategy Every 30 Days
Amazon campaigns have learning periods. New campaigns need data before they stabilize. Organic rank built by a sustained ad push takes weeks to consolidate. The seller who panics at a bad week, demands a teardown, then demands a different strategy the next month, never lets anything mature.
We’ve seen accounts where the seller reset campaign structures four times in a quarter chasing a competitor’s move, and each reset wiped the algorithm’s learning and the rank gains that came with it. The agency looked incompetent. The seller’s impatience was the cause.
What good operators do: agree on a strategy and a measurement window up front — usually 60–90 days for a structural change — and hold to it unless something is genuinely broken. Give campaigns the runway to exit learning. Judge the trend, not the Tuesday.
5. Withholding the P&L
You can’t optimize for margin you won’t share. Sellers routinely hide true COGS, freight, and landed cost from their agency — sometimes out of habit, sometimes out of distrust — and then wonder why the agency optimizes toward revenue instead of profit.
If your agency doesn’t know your real per-unit margin, every bidding decision it makes is a guess. It can’t tell you which SKUs the platform’s rising take rate has quietly turned unprofitable. It can’t set ad spend floors and ceilings that protect contribution. It’s flying with half the instrument panel covered.
What good operators do: share real per-unit economics under NDA if needed. The agencies worth keeping want this number because it lets them manage to the thing you actually care about. The ones that don’t ask for it are the ones to worry about.
6. Buying on Price and Expecting Senior Attention
You negotiated the retainer down to the floor. Congratulations — you also negotiated yourself off the senior strategist’s desk and onto a junior’s stack of 25 accounts. Agency economics are simple: the spread between your fee and the cost of servicing you is the margin. Squeeze the fee hard enough and the only way the agency stays profitable is to give you less attention, less senior, spread thinner.
This isn’t a defense of overpaying. It’s a warning against the false economy of treating Amazon management as a commodity line item. A great account manager who recovers 15–25% of wasted ad spend and lifts CVR pays for themselves many times over. A cheap one who misses it costs you far more than the fee you saved.
What good operators do: buy on the quality of the person who’ll run the account and the depth of the bench behind them, not the bottom-line fee. Ask who specifically manages your account, how many accounts they carry, and to see something they’d do that Amazon’s auto-suggestions wouldn’t.
FAQ
How do I know if it’s the agency or me?
If you’ve changed agencies two or three times and the results never change, the constant is you. Run an honest check against this list before firing again — going dark, demanding only blended ACOS, starving creative, and resetting strategy monthly will sink any agency.
Should I really share my full margins with an agency?
Share real per-unit economics, under NDA if you need to. An agency that doesn’t know your margin can only optimize toward revenue, which is rarely what you actually want. The good ones ask for it precisely because they want to manage to profit.
What’s a fair monthly time commitment from me?
A 30-minute call and timely answers to questions. That’s it. The accounts that compound aren’t the ones where the seller works hardest — they’re the ones where the seller closes the information gap the agency can’t close alone.
How long before I should expect results from a new agency?
Structural changes need 60–90 days to clear learning periods and consolidate rank. Creative changes show CTR movement in 2–3 weeks and CVR stabilization in 30–60 days. Judging an agency on a single bad month sabotages the work.
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A good agency relationship is a partnership with an information gap to close — your margins and roadmap, their advertising and creative execution. If you’re looking for a team that manages every lever — creative, advertising, and operations — Velocity Sellers works with brands doing $100K+/month on Amazon. Contact us for a free account audit.
