I think this sort of activity slightly undermines the forums post count regulations. After all, they require X amount of posts to allow images in signatures. If threads like this were common, it would encourage more people to just throw in a useless post such as "bump" in order to get their post count up without it being "random spam."

Maybe if you specify some more strict rules to this; such as ignoring posts that are unrelated or just "bumps."

Anyway, just my 2 bitcents (play on words?)
Also I am disqualifying this post.

Good luck with it either way :-/