A few months ago I went sending tons of Twitter traffic to CPAInfinity, and when the offer went down I switched over to Peerfly, went from making about $10 an hour to $70 in that first hour. Shortly after the first hour, the conversions dropped from 15% to about 3%. So I believe that they definitely shave, just like many other networks, but only when the traffic is not top notch. CPAInfinity's conversions stayed pretty steady for the most part, around 10-12% by the way.