Advertisers can pretty accurately track and price campaigns; if clicks are inflated 50% by fraud, it comes out in what they pay. Even if not in this round, the

Advertisers can pretty accurately track and price campaigns; if clicks are inflated 50% by fraud, it comes out in what they pay. Even if not in this round, then in the next. Adwords advertisers can modify their campaigns extremely frequently, but even display ads are generally sold at most on 3 month contracts. If, as DSP buying ads for a campaign, you don't hit your CPA target, then you don't get new campaigns. Now legit publishers definitely get screwed, but that's kind of ironic since the entire idea of adsense is to screw good publishers by allowing advertisers to target customers wherever it's cheapest. tl;dr It doesn't matter that much to advertisers because fraud washes out in the pricing.