Wait what? If this ever comes close to affecting me I will promptly talk to the customer service agent's boss's, boses's, boss within 15 minutes, ask for my refund, then promptly cancelling my service.
Comforting to know, but still it is a bit ridiculous AT&T... Would this be because people are running servers for multiple machines, and taking up incredible amounts of bandwith for just a measly one service fee?