Here's an idea - QANTAS has its "Club" membership, how about A/CAM? There are a few 'hard core" supporters here who are more than willing to chip in to help cover running costs.
You could introduce a Bronze, Silver & Gold level memberships - not sure what "benefits" could be offered - maybe something like caps, mugs, t-shirts or other merch could be offered or made for sale, or just a burger & chips at Expo - membership has its benefits!
Other corporate sponsorship can be considered. There's a multi-national instrumentation and control company I know that want's to add some extra "visibility" at this site
I like the raffle and competition idea as well. Not sure whether special permits are required??? I'm more than happy to offer the odd model as a prize for any raffles/comp's. Perhaps we all can look at our stashes for those kits we know we've either doubled/tripled or gone just completely mental buying shitloads of that could be offered up? We can do some brain-storming at Expo over a tasty snack and coffee huh. How about planning a A/CAM get-together?
This is a very unique modelling site that does fill a niche - we must make A/CAM stronger!