[Bakr]

Then that would just influence people to spam until they get enough posts to do so.

Honestly, nothing should be judged off of post count. Look at some of the members with the largests post counts - half of their posts are just useless crap, or don't give any real contribution to the thread. At the same time, when you look around, some of the most knowledgable people have the least post counts (based on what they have posted, at least), in my opinion.