Fake ad clicks cost the advertiser money, not the ad company.

Ad companies generally try to detect fake clicks, but any fake clicks that get through just earn money for the ad company (at the cost of making the advertisers campaign have a lower ROI)

> Fake ad clicks cost the advertiser money, not the ad company.

It also diminishes the value of the clicks provided by the ad company. It doesn't cost them dollars directly, but makes all their advertising worth less.

Good products do not need much advertising. For example, when buying DRAM, I compare the specification and prices and do not look at the advertisement.