I was thinking...... Custom maps! Will the server stay ranked?
I'm not sure. I may end up tweaking the server rotation a bit and remove some of the lesser voted on maps. For instance, in order for me to get the server jump started, I'll have to die whatever shitty map its on and vote for London (forget the technical name of it), and sure enough, players join the server pretty quickly. London is also the most voted on map.
And I've been playing a bit of KF now, mostly to get the server going but it's actually a pretty fun, unique game.