Scammers always end their prices in a 7.

But why do they actually do this?

“Scammers always end their prices in a 7.”

And the thing is, they’re not entirely wrong. Not about the number itself, obviously, the number 7 hasn’t committed any crimes. But the feeling we have about the number is very real. The involuntary little wince when you see £997 on a landing page next to a photo of someone leaning against a lambo they almost certainly don’t own.

The wince here is quite interesting.

Because the 7 ending didn’t start as a scam. It started as a split test in the late seventies, run by a direct response copywriter called Ted Nicholas who tested everything, envelope colours, headlines, price points, the lot. He found, or at least told people at his seminars, that he found that prices ending in 7 converted better than 5 or 9. Gary Halbert and Dan Kennedy, two direct mail supremos both ran with it, and within a decade the entire direct response world was pricing in 7 like it was one of the ten commandments of sales.

The convention migrated into the online course world, where it was adopted with wild abandon by people selling courses, usually on how to sell courses, which I’m pretty sure if you looked closely enough you’ll find these course sellers mentioned in Dante. And once the lowest-quality, highest-pressure end of the market makes something their own, something is rotten in the state of Denmark to borrow from Shakespeare.

It’s called evaluative conditioning. You pair a stimulus with a context enough times and the emotional response transfers to the stimulus itself. The number didn’t change but what we associated it with absolutely did.

What makes it genuinely problematic is that you can’t reason someone out of it. You can explain that the number is arbitrary, that it has nothing to do with fraud, and they’ll nod and still feel the distrust. The aversion was never rational, so rational argument doesn’t touch it.

There’s a second layer too. The moment someone recognises that a pricing technique is being used on them, they stop evaluating the offer and start evaluating you. Instead of “is this worth it” they’re thinking “why has this person priced it at £997 instead of a thousand, and what does that tell me about them.” The price becomes evidence about the seller rather than the product.

Which is precisely why luxury has always used round numbers. Round numbers, or prestige pricing as it’s called, are cognitively fluent, your brain processes them without friction. A .97 ending creates a tiny moment of disfluency, which triggers analytical thinking. In mass-market contexts that can actually help you, because the price may hold up under scrutiny. In luxury, scrutiny is the last thing you want. The moment a client starts dissecting your pricing structure, you’ve pulled them out of the emotional frame the entire purchase depends on.

You’d never see Claridge’s list a suite at £897 a night. The disfluency alone would undo everything else they’ve built.

Any persuasion technique, no matter how clever it once was, eventually becomes a signal of the type of person who uses it. The tactic becomes the tell and once your audience can read the tell, you’re not influencing anyone.