[cmiles74]

Agreed, I suspect the cost is in providing the larger amount of bandwidth to the block or neighborhood (better cabling, cable modems, etc.) Once in place, the individual subscriber usage probably all costs the same for Comcast.

[chx]

Nope, the big ongoing cost is in support. Humans.

The big upfront cost is trenching. The rest is potatoes. If you think the "big heroes" of an ISP are the router wizards, oh boy. It's the permit people. A ransomware gang has nothing on the uppity council of a town of 4000 people.