I suppose this has been done before, but I can't see a thread so...
Considering how much it must cost to run RAWK have you considered some advertising content? A tasteful (small) banner advert for a RAWK approved product (or even to the official website perhaps) would hardly be noticed by the bulk of posters, take advantage of the huge numbers of posters, help fund the costs of the site, future proof it to some degree and possibly even reward those involved.
What I have seen elsewhere that I thought was good was an Amazon referral link. Anyone wanting to buy something on Amazon clicked through to the site through the referral link and the host was rewarded for their successful advertising. It was worthwhile because it allowed the purchaser express his/her thanks without any real cost to themselves.
There is also the possibility of producing RAWK Tshirts etc and selling them as RAWK merchandise. Some will see it as commercialization (some always will) but others (and I include myself here) would see it as an opportunity to express their thanks to the site and the hard-working mods that make it possible. I often buy tshirts and tops from sites I approve of, because it is the simplistic and most effective means of expressing approval while simultaneously helping the site out.