Wow, this is fascinating! I would love to invest and start a wireless ISP on the eastside of Seattle. Suppose you have an area that is flat with lots of exposure, where everyone hates Comcast (maybe that last part is superfluous). I would think you'd find plenty of programmer customers if you have a say 200 mbit wireless connection without bandwidth caps (or maybe something insane like 10 tb/month). This seems like a much better area to invest in instead of putting more money in my 401k. It's not so much much money, less than two year's 401k contributions to run it for a year and see if it catches on.
I hate comcast with a passion, they are on the only provider in my area. Here's another fantasy, I imagine two points of presence, one at my house. I run fiber to my house as part of this business, then I've got infinite capacity. Who's up for this?
How much does it cut out if it rains, probably that is a problem here.