@marcinozga That's going to let you provide service, sure. They were paying $5 for the microwave based wireless radios they were using in the mid 2000s. That side of it hasn't really changed that much price wise in a long time.
Where are you getting the backbone connection?
From your local ISP. Once you get into the area of negotiations with major backbone providers you usually get out, that's whole different league.
If you plan to extend the service beyond what the local ISP has built out, then maybe you could do it, but it really limits the market you have available. Think of it this way, you are a potential competitor to the ISP, are they going to give you a good deal?
They don't have to. You just buy the service from them, then re-sell it. We were buying DSL lines at the regular business plan prices. I think overall we had close to 1000 customers in 30k city.
Apparently it's different where you are. Around here even the business lines often have clauses that prevent you from reselling the service :(
Not surprised - a resold line has a higher likeliness of running at or near full capacity. The sad fact is that ISPs almost always oversell their bandwidth, they have expectations of something like 30% usage over the 24 hour day.