It seems that sometimes people will post a lot of new topics in order to harvest bonus points. Just today, one user (who shall remain un-named), has created about 20 new threads, among them things as inane as "why do we wear underwear?" This just clutters things up, and makes it harder to find/use "real" topics.
Perhaps the system could put a limit on the number of "new thread credits" a person can get per day, or week, or something like that. A person could still post, but just wouldn't get a flood of bonus points. I wouldn't want to discourage people from using the forum, but it might be good to remove the incentive for abusing it.
After all, if we're going to abuse something, we might as well abuse ourselves.