I want to run servers from my home, need more bandwidth?

So I've got a number of spare computers around my house, and I figured I could make a little extra income by renting them out as game servers for the public. Problem is, my ISP only gives me enough bandwidth (upload specifically), to handle a light load (I have comcast, I get about 4mbps up on a good day). Their business class service isn't much faster, for twice the price. Anyone have any suggestions on ISP's or where I can get additional upload bandwidth for a reasonable price? Does anyone else here do this, and how do you manage?