My $.02 on the subject...
I'd be willing to pay an annual fee for the site; something in the neighborhood of $20...not the $5 per month that was suggested previously ($60per year). If we had 5000 paying members @ $20 per year, that's $100,000 per year! I have no idea how many active users we have, just going by the member #'s and throwing in a random attrition factor of like 50%. My only problem with an annual membership fee, is that potential new members can be turned off by it before they see how awesome this sight is.
I think the better idea is advertising. Tasteful, subtle (as much as possible) advertising. No pop-ups, no re-directs, no "in-your-face" flashing obnoxious ads. Just regular old banner ads on all the pages.
Like I said, that's just my $.02 on the subject.
