I personally think that post counts give a user something to strive for, but most people go about it wrong. Spamming isn't the thing to do and people do it anyway. A high post count SHOULD show that you're active and contribute to alot of conversations. Instead it's pretty much people posting one word responses or posting "I dont know" posts that dont go anywhere. No one should be without something to strive for, but the rules should be more strict about how long a post can be or what defines it as useless.
Only post if you're contributing.