Heh... all you have to do is charge a subscription fee for anyone who wants to see red-border images... that'd make you enough money to buy a billion servers in a day.
All kidding aside, though, I personally would be willing to pay a subscription fee to the site, FA helps me a bunch with getting word out about commissions, etc.
The problems I see here are:
1. Taking away something (features, etc) that people are already getting for free would cause an uproar.
2.Providing new content (ie a search) would rely on having enough server space to support it right of the bat, which kind of creates a catch 22, and defeats the purpose...
I have to admit, I know very little about the subject and the pros and cons, but again, I'd be happy to pay for the service.
Hm... one other thing just came to mind... would the removal of the gratuitous posting of images that don't abide by the rules (ie: a billion pictures of the same subject, or screen shots, etc) perhaps help to lighten the load? I see these rules broken a lot, and no action is taken, but that may just be a lack of manpower to enforce them.