Ah, so you get free bandwidth from people that want to balance their traffic for better peering contracts. That's clever. Probably not a helpful model for other areas that aren't bandwidth centers like NYC, and should probably be more out there when you're evangelizing so people understand you're getting a large portion of your operating expenses donated...

I have to assume another cost that's not noted is roof rights. That's not free - most people either have to pay or give the property management a kickback.

NYC is an interesting place for this - if you live in Manhattan, you clearly can afford the $80 for 1Gb/s FiOS or $40 for 100Mb/s FiOS or whatever Spectrum is charging. It would be way more interesting to plop this in a rust-belt city where people are on a paycheck-to-paycheck salary...