If you’ve managed Amazon PPC for more than six months, you know the pattern. It starts with the land grab. You bid high to dominate keywords. Your ACOS looks terrible, but sales are pouring in. Everyone is happy. Then comes the panic. Someone sees the profit bleed and asks the question nobody wants to hear: “Why are we spending so much?” So you drop bids to the floor. And that is when things really fall apart.
The floor is too low. Visibility disappears. Your organic rankings tank. Sales plummet. The client panics. You raise bids again. Welcome back to the beginning. Round and round it goes. We call this the Pendulum Problem, and it is destroying profitability for sellers who should know better.
Here is the hard truth that most agencies will not tell you. They treat bid optimization as a math problem focused entirely on cost efficiency. They ask, “How low can I go and still get a sale?” That is a race to the bottom against Amazon’s algorithm, and you will lose every single time. Amazon wants revenue. You want margin. If you try to win purely on low bids, you starve the machine.
There is a better way. We call it Intent-Based Bidding, and it completely changes how you think about every dollar you spend.
The Problem With Traditional Bid Optimization
Most Amazon PPC strategies treat every keyword the same way. Set a target ACOS. Turn on dynamic bidding. Hope for the best. This approach is lazy, and it is expensive.
The reality is that every keyword represents a different customer at a completely different stage of intent. Someone searching “men’s waterproof hiking boots size 10 wide” is not the same person as someone searching “hiking boots.” They want different things. They will behave differently. And yet most campaigns bid on both keywords the exact same way.
This creates two specific problems that eat your budget alive:
- You waste money showing high bids to low-intent shoppers who will never convert.
- You lose sales by showing low bids to high-intent customers ready to buy right now.
The fix requires rethinking how you categorize and bid on keywords entirely. It is not complicated, but it does require discipline.
Two Strategies for Two Types of Intent
At our agency, we classify every keyword into one of two human behaviors. This one shift changes everything about how we approach bidding.
Discovery Keywords: High Bid, Low Tolerance for Spend
These are specific, low-volume terms that a ready buyer types when they are inches from clicking “Buy Now.” Think of phrases like “men’s waterproof hiking boots size 10 wide.” The customer knows exactly what they want. They are comparing prices and reviews. One wrong click and they buy from your competitor.
The strategy is simple: Bid above the suggested range. Be aggressive. You want position one. You are not looking for volume here. You are looking for conversion velocity. Yes, the ACOS on these terms can look ugly at first. That is fine. The velocity primes your organic ranking. You win the long game by losing money in the short term on the right keywords.
How do you know if this is working? Watch your organic rank on these specific terms. If it climbs within 30 days, the strategy is working. If it stays flat or drops, something else is broken and needs attention.
Harvest Keywords: Lower Bid, High Volume
These are high-volume generic terms where customers are browsing, not buying. Think of phrases like “hiking boots.” The customer might buy today. They might buy next month. They might buy from REI. Your job is not to close the sale immediately. Your job is to get in front of them and stay top of mind.
The strategy is different here: Bid below the suggested range. Use a fixed bid. Do not use dynamic bidding for these terms. You are using these keywords to fill the top of the funnel and retarget later through Sponsored Brands or Display ads.
Here is the accountability question most people miss: If the ACOS on “hiking boots” is 30% but your overall blended ACOS across all channels is profitable, you are winning. Stop optimizing individual keywords in isolation.
What Most Agencies Get Wrong
This part is painful to say, but it needs to be said. Most agencies do the exact opposite of what works. They bid high on generic terms, wasting budget on tire-kickers who search broad phrases and buy nothing. At the same time, they bid low on exact-match terms, missing the easy sale from customers who are ready to buy right now.
The fix is straightforward: Flip the script.
- High intent plus low volume equals high bid. Sacrifice margin for velocity.
- Low intent plus high volume equals low bid. Harvest traffic for retargeting.
That is it. This one change can transform your Amazon account in 30 days.
The Time Decay Rule That Feels Wrong But Works
Most advertisers use Amazon’s “Dynamic Bids Down Only” feature. It sounds smart. The algorithm automatically lowers your bid by up to 100% if conversion is low. The problem is that it often turns off your ads during the learning phase, before the algorithm has enough data to optimize properly.
We use a counter-intuitive rule that makes people nervous the first time they hear it: If a keyword has zero conversions in the last seven days, we increase the bid by 20%.
I know how that sounds. Why would you bid more on a keyword that is failing? Here is the logic. If a keyword is not converting, it means the algorithm is showing it to the wrong people. This is not a keyword problem. It is a targeting problem. Lowering the bid, which is what most people do, only shows it to even costlier people. The algorithm gets worse.
By increasing the bid, you force Amazon to re-evaluate the auction. You widen the net. Often, you break the seal and the keyword starts converting. Once it hits a consistent conversion rate of three or more sales, you drop the bid back down. This strategy only works if you are watching daily. Set alerts. If a keyword that was converting suddenly stops, investigate immediately. Do not wait for a weekly report.
The Negative Pivot: Killing Broad Match
Amazon’s Broad Match is terrifyingly powerful and equally wasteful. It can match “red dress” to “black shoes” and still charge you for the click. Most agencies set Broad Match and forget it. They watch the spend pile up without understanding what they are actually buying.
We treat Broad Match like a live grenade. Here is our 30-day rule:
- Days 1 through 14: Run Broad Match with high bids. You are in discovery mode. Let the algorithm surface new terms.
- Day 21: Analyze the search term report. Any term that spends more than $10 with zero conversions gets added to Exact Match Negative immediately.
- Day 30: If the Broad campaign is not generating clean, profitable spend on new, relevant terms, kill the entire campaign. Pivot to Phrase and Exact match only.
The insight is simple: Broad Match is a research tool, not a profit center. Stop treating it like one. If you do not have the discipline to audit it weekly, you are paying Amazon to guess.
Building a Dashboard That Actually Helps
We build custom BI dashboards for every client we work with. This is critical for Intent-Based Bidding because you need to see different data than what Amazon provides by default. Most advertisers look at ACOS by campaign. We look at ACOS by intent classification. This allows us to see if our Discovery keywords are actually driving organic rank improvements.
We also track time-to-conversion by keyword. A keyword that takes 14 days to convert is fundamentally different from one that converts in two hours. They require different bid strategies entirely. Finally, we track blended profitability. If your Discovery keywords are losing money but your Harvest keywords are profitable and your organic rank is climbing, you are winning. Do not let a single ACOS number deceive you.
What This Means For Your Business
Amazon PPC is not about lowering the bid. It is about managing intent. Here is the full framework:
- High intent plus low volume equals high bid. Sacrifice margin for velocity.
- Low intent plus high volume equals low bid. Harvest traffic for retargeting.
- Zero conversions and fresh data equals increase bid. Break the seal.
- Dirty Broad Match spend equals immediate negative. Cut the fat.
Stop optimizing for a single number on a dashboard. Start optimizing for the human typing into the search bar. Most agencies will keep playing the Pendulum Game. They will chase ACOS targets and wonder why Amazon keeps taking their money. The smart ones will adopt Intent-Based Bidding. The choice is yours.
