7 Amazon PPC Mistakes UK Sellers Make (And How to Fix Them)
If you're running Amazon PPC campaigns in the UK and watching your ad spend climb while your sales stay flat, you're not alone. Pay-per-click advertising on Amazon is one of the most powerful tools available to sellers — but it's also one of the easiest to get wrong.
The difference between a profitable campaign and a money-draining one often comes down to a handful of avoidable mistakes. In this guide, we'll walk through the 7 most common Amazon PPC mistakes UK sellers make, and more importantly, exactly how to fix each one.
Mistake 1: Running Automatic Campaigns Without a Strategy
Automatic campaigns are the entry point for most new sellers — and for good reason. Amazon's algorithm does the heavy lifting, finds relevant search terms, and starts showing your ads without much setup. The problem? Most UK sellers leave their automatic campaigns running indefinitely with no structure and no review process.
Automatic campaigns are research tools, not profit machines. Their purpose is to discover which search terms customers are actually using to find your product. Without a plan to harvest those terms and move them into manual campaigns, you're essentially paying Amazon to collect data you never use.
The fix: Run automatic campaigns for 2–4 weeks with a modest daily budget (£10–£20). Then go into your Search Term Report, identify the keywords with clicks and conversions, and add those to a separate manual campaign. Simultaneously, add poor-performing terms as negative keywords in your auto campaign to stop wasting spend.
Mistake 2: Ignoring Negative Keywords Completely
This is one of the most expensive Amazon PPC mistakes UK sellers make, and it silently destroys budgets every single day. If you're not actively adding negative keywords to your campaigns, your ads are almost certainly showing up for irrelevant searches.
A seller listing premium leather wallets might be showing ads for "cheap wallets" or "kids wallets" — searches that will never convert but still cost money per click. Over weeks and months, this wasted spend adds up to hundreds, sometimes thousands of pounds.
The fix: Download your Search Term Report weekly. Filter for search terms with zero orders and more than 5–10 clicks. Add these as negative exact or negative phrase keywords immediately. Build a negative keyword list from the start and treat it as a living document you update regularly.
Mistake 3: Setting Bids and Forgetting About Them
Amazon PPC is not a set-it-and-forget-it system. Many UK sellers set their bids during campaign launch and never revisit them. This is a critical error because your optimal bid changes constantly — competitor behaviour shifts, seasonal demand fluctuates, and your own conversion rate evolves as reviews accumulate.
Leaving bids static means you're either overpaying for clicks when competition drops, or being outbid entirely during peak periods when you should be capturing maximum visibility.
The fix: Review and adjust bids at minimum once per week. Use the ACoS (Advertising Cost of Sale) for each keyword as your guide. If a keyword's ACoS is significantly above your target, lower the bid by 10–20%. If it's performing well below target, increase the bid to capture more impressions. Consider using Amazon's dynamic bidding feature — "Down only" is the safest starting setting for most sellers.
Mistake 4: Targeting Too Many Keywords at Once
When sellers launch PPC campaigns, the instinct is to go wide — add every remotely relevant keyword and let the data decide. In reality, this approach spreads your budget so thin that no single keyword gets enough data to be useful, and your campaigns never properly optimise.
A campaign with 200 keywords and a £30 daily budget might generate just a handful of clicks per keyword per month. That's not enough data to make informed decisions about what's working and what isn't.
The fix: Start focused. Build tightly themed ad groups with 10–20 highly relevant keywords each. Give each campaign enough budget to generate meaningful data — ideally 50+ clicks per keyword before making decisions. Quality over quantity is the rule in PPC management. Once your core keywords are profitable, expand from there.
Mistake 5: Not Optimising the Listing Before Running Ads
Running PPC traffic to a poorly optimised listing is like pouring water into a leaking bucket. No matter how well your ads perform, if your product title, images, bullet points, or price aren't competitive, your conversion rate will be low — and a low conversion rate means a high ACoS.
This is one of the most overlooked Amazon PPC mistakes UK sellers make, particularly those who are new to the platform. They invest heavily in advertising before their listing is ready to convert.
The fix: Before spending a single pound on ads, ensure your listing is fully optimised. This means a keyword-rich title within Amazon's guidelines, high-quality images (minimum 7, with lifestyle and infographic shots), compelling bullet points addressing customer pain points, an A+ Content page if you have Brand Registry, and a competitive price point for your category. Only once your organic conversion rate is strong should you drive paid traffic.
Mistake 6: Misunderstanding ACoS and ROAS Targets
ACoS (Advertising Cost of Sale) is the most commonly misunderstood metric in Amazon PPC. Many UK sellers aim for the lowest possible ACoS without understanding that different business goals require entirely different targets.
A seller launching a new product should expect — and accept — a high ACoS in the early weeks. The goal during launch is visibility and review accumulation, not immediate profitability. Conversely, a mature product with strong organic rankings should have a very low target ACoS because PPC is supplementing organic sales, not driving the entire business.
The fix: Calculate your break-even ACoS first. This is your profit margin percentage before advertising costs. If you make 35% margin on a product, your break-even ACoS is 35%. During launch, an ACoS of 50–70% may be acceptable. For mature products, target 15–25% ACoS. Understand where your product is in its lifecycle and set your targets accordingly.
Mistake 7: Running PPC Without Tracking the Right Metrics
Clicks, impressions, spend — these are the numbers most sellers watch. But clicks alone tell you very little. Without tracking the full picture, it's impossible to know whether your campaigns are contributing to your business or quietly undermining it.
Many UK sellers don't track Total ACoS (TACoS), which measures ad spend against total revenue — not just ad-attributed revenue. This metric reveals how dependent your business is on paid advertising and whether your organic sales are growing alongside your ad activity.
The fix: Track these five metrics consistently: ACoS per campaign, TACoS overall, Click-through Rate (CTR), Conversion Rate (CVR), and Impressions share for your top keywords. Set up a simple weekly tracking spreadsheet and review trends over time, not just weekly snapshots. A rising CVR combined with falling ACoS is the sign your campaigns are truly working.
Frequently Asked Questions
What is a good ACoS for Amazon PPC in the UK? A good ACoS depends on your profit margins and business stage. For most UK sellers, a target ACoS between 20–35% is considered healthy for established products. New product launches may run at 50–70% ACoS temporarily to build momentum and reviews.
How much should UK sellers spend on Amazon PPC per day? There's no universal answer, but a practical starting point is £15–£30 per day per campaign for small to mid-size sellers. The key is ensuring your budget isn't hitting its daily cap before the day ends — if it is, either increase the budget or tighten your targeting to make the spend more efficient.
How long does it take for Amazon PPC campaigns to become profitable? Most campaigns need 4–8 weeks of data before they can be properly optimised. Profitability timelines vary by product, competition, and how actively you manage your campaigns. Sellers who review and optimise weekly typically see results significantly faster than those who check in monthly.
Do I need to run PPC if my product already ranks organically? Yes, in most cases. PPC and organic ranking work together. Running ads on your top-performing keywords reinforces your organic position, and the additional visibility from both paid and organic placements significantly increases your total sales velocity.
Stop Losing Money on Amazon Ads — Get Expert Help
Managing Amazon PPC profitably takes time, expertise, and constant attention. If you're spending hours in Seller Central every week without seeing results, or if your ACoS keeps climbing despite your best efforts, it may be time to bring in a specialist.
At EcomSolz, our Amazon Virtual Assistant service includes full PPC management — from campaign structure and keyword research to weekly bid optimisation and performance reporting. We work with UK sellers across all categories to bring ACoS down and revenue up.
Book a free consultation today and let's audit your current campaigns — no cost, no commitment.
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Published by EcomSolz | UK eCommerce Agency | Amazon, Shopify & TikTok Experts