[nemilar]

This may actually be much easier in a rural area, as opposed to urban/suburban.

Rural landowners have large tracts of land, and the land is in fewer hands. You need less individuals to buy-in, since a single buy-in on the project can mean miles of line.

You don't need a jackhammer to dig up sidewalks and streets, and you (presumably) don't need as many (if any) permits; you don't need to take as much care not to disrupt existing utilities, and you don't need to worry so much about noise and other regulations.

[kbob]

The ratio of landowners to households should be very close to 1:1 in the country. (-: In the city, there will be somewhat fewer landowners because of multifamily dwellings (apartments and similar).

I agree with your permits and jackhammer points.

[ricardobeat]

Shouldn't this be a very attractive market for commercial ISPs then?

[InclinedPlane]

Of course not, the expense of the fiber and equipment itself is the same but the number of customers and thus the maximum revenue is far lower.