It's an mmo server Xeph. Consider this: A private RO server (which is a relatively simplistic game) with approximately 80-100 players online will chew up around 800GB of bandwidth per month. I've only ever seen minecraft, as I refuse to play another mmo while in school. But from what I've seen, it looks like a relatively simplistic game. Seems to have some changeable world stuff, a few enemies here and there, and very few actual things the player can do (mostly it's the same repetitive thing over and over). It's also a bit faster paced than something like RO, meaning that it's probably sending/receiving data, or expecting to send/receive data at a faster rate (being this is a first-person game it'd likely use UDP). Because of that, as well as the need to send all that world changing data to any nearby players who can observe it, it'd probably be at least 250GB+ / month for around 12 players.
