If you get another ad for a product you already bought the advertiser already paid for placement, a click through is just a bonus on top of that. Even more when information is so secretly guarded that any analysis of the impact of an ad is extremely flawed, it hasn't solved the old adage from John Wanamaker:

> Half the money I spend on advertising is wasted; the trouble is I don't know which half

It's meant to be that way, the ad platforms do not want advertisers to know what is waste and optimise their ads further than what's needed to keep them advertising, they just need to throw some bones here and there, convert a few people through clicks, to make themselves look indispensable.

There's no incentive to improve that, at all.

Easy --- advertisers pay for bad ads the same as good ones --- why bother stopping the bad ones?

Convincing so many advertisers to just blindly trust the system and buy into the concept of black box "personalized" advertising is actually the real marketing coup here.

According to some stats, global use of ad blockers is now over 40%. Once it exceeds 50%, I believe this stupidity will slowly start to die out.