It's designed to increase forum activity awarding trophies for milestones: post count, how long someone has been on the site, number of likes, etc. Several years ago when I first started the Sportsbook it was linked in to your cash balances so you'd get "paid" on activity giving more money to wager with. IE: A $1000 for a new thread, $10 for a reply, etc. We used to have Texas Hold-em games on Friday and Saturday nights here where that "cash" could be used.
Now it's just a function taking up space...I guess I should hide the text in the member card.
Here's an example from another forum which uses the system.
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