Pretty good business. I know of one in Manhattan that sits on $30k a month in commercial space. The pipe they use for the network is a 100mbs cogent pipe @ $3k. It has about 50 cpu's in it and leases out the basement as rental office space (cubicle rental, conference area and mail service) They bought all Alienware computers and everything else is expensive so they have to be turning a nice profit to still be around 3 years later. They charge $6 an hour and is only half full most times but of course during the prime time (after school) it seems to run at 90% capacity til close.
http://www.web2zone.com is their site if you want to see it.