Why don't you put up a rakeback page for people to check what they are recieving and what has been deducted?
I only ask as the amount of post in the Full Tilt section of the forum is unreal. The affliate I am registered with has this and surely adding one page to your website would be a great time saver for the future?
Here's a screenshot to show what I mean.

Obviously doesn't affect me, but just a thought for you.