Yeah, but with PPC ads everyone knows it happens and doesn't care. Ad fraud in general is a bad analog; when an advertiser buys an ad, they're looking for a cer

Yeah, but with PPC ads everyone knows it happens and doesn't care. Ad fraud in general is a bad analog; when an advertiser buys an ad, they're looking for a certain response from a campaign. If they get the response for the dollar amount they paid, they don't care what the CPM is (and all removing the fraud would do is raise the CPM). Micropayments would be a different story since the money would be coming out of individuals' pockets.