I've always just ignored the threads myself, it never seemed like much of an issue. I admit years ago there were days where I thought I might pocket some extra cash for nothing, but never did I ever win a contest. I tossed the idea out the window and have rarely opened a contest thread since.
I think the simplest way to curb the contest threads is to change the rule so that those entering to win do indeed need to be an active affiliate, or to limit the max number of posts/prices per thread.
|