The ad networks don't seem to want to reduce fraud much. Possibly mostly because reducing fraud comes at the expense of denying real users, and the eventually-C

The ad networks don't seem to want to reduce fraud much. Possibly mostly because reducing fraud comes at the expense of denying real users, and the eventually-CPA-adjusted auction model means that the fraud should just be "factored into the price" and in that sense it's not a problem, and so they'd rather not deny 10 fraud clicks if it means accidentally elimininating 1 real click. But whatever the reason, they mostly view it as an issue advertisers should deal with. On the advertiser side, fraud has a small impact due to idiot brands bidding up prices and also another small impact due to the fact that you need to cull all the worst placements/domains when you first start using a network or launch a campaign. On the publisher side, each fraud penny earned is a penny directly taken away from legitimate publishers. Fraud is much more a problem for publishers than for advertisers.