I assume your feeding into high speed cable? Does your cable company ding you anything extra for the extra bandwidth use? I'd really like to try setting up a feed, but I don't want to start it only to have to stop later.
I used to use Time Warner Road Runner as my ISP during my "ATC feed" tenure but then switched to Verizon FiOS. In both cases the bandwidth used month to month to upload a continual stream to LiveATC's servers was small enough to be off their upload radar.
Verizon actually specifies in their TOS that they prohibit their customers using their computers as servers (Web, FTP, P2P, etc) while on the FiOS network - perhaps even RR has this prohibition now as well? If Verizon were to ever question my upload use, I have my argument ready that I am simply sending data to one other computer, which is true.