Unfortunately, that thread has indeed become spam breeding grounds. Can't be sure of this, but the "I Think I'm Going Out of My Head" thread could have started up as a current version of the old "Random Randomness" threads, which again was done because the older threads got buried by newer ones.
Actually, we used to have a system that combined what D'Snowths and Dwayne mentioned. Whenever a new member signed up, their first few posts would be invisible to the community at large, but any member of the staff could see them and approve or delete them, as said posts were in need of mod approval to become public. After a handful of such got approved, the member joined the community at large. Initial problem posts would be deleted... But if said member acted up, a first infraction would result in a temporary Strike 1 banning of seven days. When they returned, if they continued carrying out like actions, they got a Strike 2 banning of thirty days for a full month. And if they decided to return after that, still posting the same kind of things that got them the temporary suspensions, then it was a Strike 3 permanent ban from the forums.