The idea has merit, and the incentive is good. It will be something I was going to look into after I settle the hosting situation and get full access back to all of the members and guests.
I was also thinking of a user-based system, maybe with something like google ads at the bottom of the board pages. But was going to have a poll before doing something like that, because I would still like to see no or limited advertising here. I just hate those fan forums that are crowded by advertising.