Any specific reason? There are dozens of posts on here about people who have been successful with them.
I was successful with them till and advertiser that decided not to pay them and their reason was because every lead had a fake address and thats totally false, ive provided adword stat screenshots ive been a member for copeac for months this advertiser was on the program for 5 days and they take their word over mine without any real proof or payment from the advertiser
You seem to be having a small issue with them, fraud is something that needs to be ironed out with the network. I've gotten a check from them.