How about you remove the 100 post requirement for making new threads? This would promote two things:
1) It would add credibility to the forums "1 million posts" advertisement, as the ad would no longer be tarnished by the thought that it was really just 10,000 users each making 100 garbage posts
and more importantly;
2) It would let new users, such as myself, obtain the information they need when deciding to join the forum and being unable to find a suitable post.