I think the 'senior member' idea, or a number of posts limit is a good idea - it would soon become apparent if someone had 100 posts and not having said anything really - if they did get to that point and weren't adding to the community in a constructive manner they could still be restricted by a MOD, or banned.
I know I haven't really said anything here that hasn't been said before, but I'm all for it
I think it is Olstars call, simply delete the loose cannons that just post for the 'for sale' /free advert thing.
we want this to grow and be respected more and more, got to be honest, we shouldnt be elitist (we all started with 1 post) but we should try and suss out the fools!