Im not sure if they realize that even though they do not have an IT person; there are online management providers for servers such as http://www.platinumservermanagement.com/.
This is just one of many off the top of my head. Different companies cover different operating systems and software depending on what the server is used for. This server is not to complex, especially the forum side. Now for a mere 30$ to the company i posted above, they would harden the server if not already(im sure there is some sort of IT intelligence over there). They also will update any out of date software that may be running. They can also take care of the spam problem. There is nothing but a 30 dollar a month commitment.
So if you only want service for a month? No problem, pay the 30 dollars and your good. This is a small issue that would take me only a few hours to fix. I know of high school kids whom could also help them with the issue. I would almost donate money to them have someone fix it; but im guess that the site's security is lax the whole way round. At this point, if i were really inclined to help them, I would breach the server myself, Taggit, Harden it, Update it, then a few security mods for spam and new user registration.
What I may be inclined to do though, is put this out as a challenge to a few high schoolers from the surrounding counties.