Google goes CPA - Hello adverse selection

Read an interesting article in the WSJ today about Google testing out CPA Adwords with a select group of advertisers.

Philip Remek, at analyst at Guzman & Co. postulated this is the way to eliminate click fraud, where in reality the could cause adverse selection for the non-cpa advertisers in the mix. People generating fraudulent clicks will quickly be identified, while non-cpa with no real post-click measurement could get hammered.