Airline tickets for the website ? Seriously you think about the cga as a whole, while we talk "only" about the website.
So i'm not sure if i would see the website as a marketing tool for the rest of cga, ie leave it free, or if i would like the website to be a "professional" solution, means we should pay a monthly/yearly fee for access to the forums, or parts of the forums (fori ?). I guess if you do the last you will initially loose a lot of members, but time will tell.
My main concern is that you now try to make the website nice for advertisers first, while on a paid website you can concentrate on your clients; and a special forum for advertisers with a special fee where they can post their ads would be an option too, and give the advertizers direct contact to the clients.
Just my two european cents (= 4 american cents )