I suffer, for now, from the curse of a 5GB internet data transfer limit each month and am always having to pay extra due to the amount I use the internet...and that's a lot.
It came to my attention a while ago that a large server full of people would drain tirelessly on any transfer limit, and at one point on my own server I managed to use up 100MB in less than an hour and it's never been exactly crowded. Given that a single month is over 700 hours that cost a bit =P.
So my question is, for an average server, how much data is transferred per minute, per hour or whatever? With this nice bit of info I could start hosting a server again perhaps in the knowledge that I won't have to pay for 7-hour-a-day playing time; Perhaps.