There is an interesting side discussion as to transparency of ad exchanges. I run a site with significant traffic that is supported by ads served by an ad exch

There is an interesting side discussion as to transparency of ad exchanges. I run a site with significant traffic that is supported by ads served by an ad exchange. I can track the number of views and the number of clicks and thereby audit the exchange's numbers. What I can't do, is ever know if I'm getting a fair share of the underlying ad revenue since there is no published formula to translate hits/clicks/CPM to dollars. What is your experience with this and how have you come to trust or distrust your ad exchanges?