The costs aren't too bad, the commercial forum software is a few hundred dollars a year, the SSL cert isn't too bad, and I'm hosting the site on one of the dedicated servers I have with some other sites on it (this isn't a very high-traffic site). I hate bots and spammers, so I don't mind putting in a bit of extra effort to help insure their appearance here is very rare. I do need to update the software to the latest version soon, which brings some nice, new functionality as well as the usual slate of bug fixes. I plan on doing that in October.