I hope I am going to able to make about the same this year. It would cover the hosting costs. I generally charge a $20/year membership fee, although, you can play without paying. There are lots of freeloaders.
I got about 120 paying members last year. Overall I have about 17000 registered members of whom about 100-150 actively play everyday, totaling about 1000-1500 active players for 2007. Sorry, the last number is a guess.
It's a rather crude multiplayer turn-based strategy game, but it turns out there are not only older folks (33y) like me, but quite some younger people that also enjoy the game.
Hope that helps?