Why Is My CPM So High? What Actually Drives It

A high CPM is almost always driven by some combination of auction competition (more advertisers bidding for the same audience), a narrow or oversaturated audience, seasonality, and creative quality — platforms tend to charge more to show ads that get less engagement, and less to show ads that hold attention. There's no fixed "normal" CPM figure across niches or seasons, so the useful question isn't whether your CPM matches a benchmark, it's which of these drivers is pushing yours up.

Is it the auction, not you?

CPMs rise and fall with how many advertisers are competing for the same audience at the same time, which is largely outside your control. Seasonal spikes around high-competition shopping periods are a normal auction dynamic, not a sign your account or creative is broken. If your CPM jumped industry-wide, the auction is the more likely explanation than anything in your account.

Is your audience too narrow?

A tightly restricted audience gives the platform fewer people to show your ad to, which pushes up the price per thousand impressions simply from limited supply. Broadening targeting, when your offer supports it, gives the delivery algorithm more room to find efficient impressions rather than repeatedly bidding into the same narrow pool.

Does creative quality actually affect CPM?

Yes — ad platforms use engagement signals to price impressions, so an ad that gets watched, engaged with, and acted on tends to earn a lower CPM than one people scroll past. This is why hook quality matters even for a metric that looks like a pure media-buying number: a stronger hook rate signals to the platform that your ad is worth showing, which can bring effective CPM down over time even without changing your bid.

What can you actually control?

You can't control the auction or the season, but you can control creative quality and audience breadth. Testing more creative variants gives the platform more signal about what resonates, and a stronger hook directly improves the engagement signals that feed into pricing. This is where creative volume becomes a lever on CPM, not just on conversion — the more genuinely different, well-hooked variants you have running, the better your chances of surfacing one the platform rewards with cheaper delivery.

How does Polaris help here?

Since testing more hook and format variations is one of the few CPM levers actually inside your control, being able to produce them quickly matters. With Polaris, you describe a new variant directly to Claude, attach your product photo, and a live panel renders the finished ad in the same conversation, typically in under three minutes — making it practical to test several creative angles instead of running one ad and accepting whatever CPM the auction hands you.

What should you check next?

Run your numbers through a ROAS calculator to see whether a high CPM is actually hurting your margin or just looks high in isolation, and draft new hook angles with the hook generator. See AI UGC ads and generating ads inside Claude via MCP for more on using creative volume as a lever.