I was thinking what could I do for my publishers so they always have a paying advertisement being displayed. So I thought of this idea In the event that there is no ad inventory for a publisher CPA advertisements would display. The only difference is the publisher would still receive a payment for each click of 0.01 - 0.05 cents. But if they make a sale on the CPA they will receive a bonus of they total commission received from the click. This can be $1.00 - $20.00. So what do you think about that?