Ah -- the admin board. Possibly. But that is mostly just Alex and HarryT. (Plus a few others who don't appear to be around as much.) I suspect even the Editors who span the whole forums are just volunteer-mods-on-steroids.
Where would the money come from though? Ads for non-logged-in guests, plus Amazon referrals, probably just barely covers the cost of the servers. This is the kind of thing people do in their spare time -- and some people have more spare time than others.
But not copious spare time, especially the relative few who would be able to update the website backend.