Phinz brought a good point in a thread earlier. There seems to be a trend of people starting threads and then not participating in their own threads. Maybe threads like this, in the main forum, should be moved if the origins poster doesn't participate after about a week. I would also base it off how often they post.
Here's an example. So User X posts a thread in the main forum bitching about GMs. He has been a member for five years, but only has 223 posts. The thread stays alive on the first page for a week, but only because of other member posts. User X hasn't been seen for a week. So the thread is either locked or moved to spam.
Just a suggestion. Please add any ideas.