The ISP bill is only part of the overall cost, and a small piece of it at that. You also need a physical address for that connection to be installed at, power for equipment, and someone to respond when something inevitably goes wrong (admittedly the person could cover multiple cities potentially).
Years ago, I knew a guy who wanted to do that with devices in used trailers. Managed by locally recruited "fake" residents, working as consultants. Located in trailer parks around the US.
