I believe it is a standard feature on many forums to stimulate discussion and posting contributions. Things like the most posts or a certain number of posts garner a "trophy" to that user. Honestly, I do not care about these things. Every other forum I am a member of that has these things always leads to post whoring and useless contributions by many users to earn a new "trophy." While the quantity of posts increases the quality of the posts degenerates noticeably.