I\'ve been to a few forums with stuff like this. To be honest, a lot of it, beyond post count, starts to encourage spam. I just mean to say that I\'ve noticed that spam is more prevalent on sites that have multiple rewards for posts.
One site:
2 gold, per reply, 4 per new thread.
1 exp per post, level is posts + time registered/24 or something.
I noticed on that site that most people replied with 1-5 word answers to 40 posts a day, to get gold to buy classes, avatars, weapons, etc.
I\'m not saying it\'s a bad idea, just one that should be carefully considered, and if implemented, one that will require a stronger anti-spam policy by the mods.