Um, off the top of my head:

"You'll be happier if you purchase this thing"

"You're not good enough as you are now, but you will be if you purchase this thing"

"Other people you admire or respect have purchased this thing, and if you do too you'll be more like them"

"Other people will like you more if you purchase this thing"

"You'll be more attractive if you purchase this thing"

"This thing will be worth more in the future so if you purchase this thing it will make you money"

"This is your only chance to purchase this thing, so if you don't it now you'll miss out on this price"

I don't think any of them has to do with how awesome "the thing" itself is. Obviously there's more to, say, an expensive watch, than its ability to tell time

The only products that sell this in advertising actually provide those brand features. Essentially people pay money to increase their perceived status.

Like, if you sell a luxury handbag. When people buy it, they know 70% of the value comes from the advertising saying "this is a high value product" as a status signal. I think that's really dumb, but that's what people want.

It also existed a long time before ads itself did.