ajinkya007 wrote:

actually instead of just keeping ranks on post counts, ther shud be points for the rate of importance of the post n then ranks shud be given.

Yea like a karma system, if you post valuable, helpful comment then you get positive karma. If you have negative karma because of non-helpful, spam-like, necro post, or trying to pad post count, it will take away privilege to post or limit it. To prevent abuse submitted karma has to be approved by admin.