I know one thing that was done on an invert. forum I used to be on, is that the subscription would be different for people who paid in a small fee to be a member. I don't remember everything that it involved, but I know that one of the things you could do is change your "posting title", so that rather than being "juvenile snake" or "second shed"....you could change it to something else. (They had the posting titles by stages in a tarantula's growth....I changed it to Invertabrain...
) Also something they did was sell calendars (a bit late for that now) and T-shirts with the forum's logo on it. I imagine there's lots of ways to raise cash, that a lot of us would be willing to do.
Roy