I used to use Dollar Traffic alot (I won the Rolex contest a few years back) But I stopped using them when there were some technical issues in the admin (I couldn't log in & no one would rpely to me) & then I was threatened to be sued by a content provider because some of the banners you were using didn't have the proper licenses or something silly like that (I think this was resolved, but it did carte the shit out of me at the time)
Actually, I just tried to log in & I got a mysql error
My username is, of course, "greenguy" - let me know what's up
