Most serious spammers use IP rotators and are impossible to ban. Each and every spam attempt will appear to come from a different IP address. They have been at it for a long time and are intent on advertizing for free.
Expect about 1/3 of the posts in the Variants forum to be moved there. If a post of yours has disapeared, theres a good chance I put it in there (might of done it by accident, kinda Mass-Modding here :))