Honestly, I know it's been ground into the ground (ha), but you folks should consider implementing a minuscule mandatory amount paid per month to allow us to play. I mean, seriously, I'm broke as hell (damn recession) and I'd be willing to fork over $1 or $5 a month just to make the server stable. Even people who HATE pay to play usually don't bat an eyelash at a buck a month. With the bare minimum of maybe 500 people playing per month, that's more than enough to upgrade the server within a year.
Alternatively, selling t-shirts with just the H&H on them would work. Shirts with random washed-out looking logos seem to be all the rage now.