As I mentioned in the other thread, this business model doesn't really work for this site. People have no incentive to pay $20 to remove ads from a forum. As many people mentioned, they use a free plugin to block the ads anyway.
A better strategy is to sell stuff. Sell FH merch and open an affiliate store. I would gladly buy all my Dolphin gear through FH affiliate links. If you had a well-integrated affiliate store on this site, I imagine it could be pretty successful, especially if you made it a prominent part of the forum.