GMS has recorded "136,000" users " Best Ever "

Read again some of you; it's how many users are on at once all the time, not how many total players there are. Good god 136,000 on all the time? That's still a lot of bandwidth to be sucked up. Imagine if even a million were on at once. They'll need backup powa. Know this, even good private servers can at most host a couple hundred people. You gotta imagine how much power they need to host 136k.

http://www.ac-web.org/forums/showthread.php?t=56841

Feel free to use this thread to do server power calculations.