Unfortunately I think you have it backwards. Malware ads are being displayed because they are winning the auctions. That's because - on a CPM basis - malware a

Unfortunately I think you have it backwards. Malware ads are being displayed because they are winning the auctions. That's because - on a CPM basis - malware authors are probably the ones who will always be able to pay the most. A successfully infected machine is worth a good chunk of change. Ad networks are uniquely suited to malware delivery. Have an exploit which only works for OS X users? Don't bid on the windows users.