Just looked at your page
http://www.hardcore-thumbs.com/top100.html
I would contact the webmaster of justsexxx.com and let him know that you need to kill that trade due to unprodcutive traffic. That is the only trade you have that has poor productivity. But I never heard of him, and would not clainm that he is cheating you. No matter what, the trade sucks for you.
As far as cheaters go, you can e-mail me and I'll tell you how you can use UCJ4 to protect yourself.
ssysak AT earthlink.net