Comment I build fiber (in my spare time) (Score 5, Interesting) 446
I can tell you much of the problem is about how to retrofit existing areas. New builds get fiber, but anything that existed before 2014 or so is a legacy build. I live in an area that was built in the late 90s and there's no hope of getting anything fast out here so I'm doing it myself. The costs are reasonable (about 30-50k/mile) but the majority of the issue is in permitting to go underground. (If you go on poles, it's actually just as expensive as underground in many cases due to annual fees on the poles, engineering studies, tree clearing fees, make-ready, etc.. Plus then you need to own a bucket truck and other expenses).
The wholesale cost of the bandwidth is nothing, it's all about the cost to put the stuff in the ground and the permit process. Expect 30% of your costs (and 90% of build-time) to be constrained by engineering and permitting costs. The rest of that 30-50k USD/mile cost is the labor and materials needed. You need to put in a place every 2-3 homes you pass to deliver service. There are a lot of people doing this in rural areas to close the gap but most people have only heard of the incumbents so there's a market awareness problem. Many people that are WISPs (see WISPA.org) are now moving into the fiber world, but the capital costs are around 50-250k to get all the equipment you need for underground construction.
Rough costs if you care: 35c/ft for conduit, 7-10c/ft for fiber (once you get large counts like 96 count, it's closer to 1c/strand/foot) and $100-300 for a pedestal or hand-hole, plus splice trays, etc. $1/foot (linear) * $1/foot (depth) for your route if it's not complicated. Costs go up in urban environments very quickly if you have a lot of requirements or other utilities to dodge.