I think it would be a good idea to but a time limit on a thread's bump post button. Say a month or so? Surely by then everyone who was gonna post something to that thread already has. It's one thing if some one has something worth adding to a thread but I don't see a need to be bumping threads just to be bumping threads... and people who do reply to old threads with something insignificant will probably cause the thread to go suicidal.