The number of users logged onto the forum is pretty fractional compared to the number of users hitting the site (and all other sites I have on this account) as a whole.
I'm looking into options to upgrade the account. It'll quadruple my (admittedly fairly modest at this point) monthly server costs, and will involve a 12-48 hour downtime for everything at some undefined point within a 2-week span. I probably won't be willing to do that until October; August is a bad month for my sites to be down.