Mod parent up! Wireless opens up many doors for ISPs. Infrastructure is the biggest cost, and wireless infrastructure makes it possible for just about anyone to become a tier 3 ISP.
Want a neighborhood ISP? Fast and easy: just put a tripod on your roof with a couple sector 3.65Ghz APs, and connect it to a router with a fast backbone. Add more components to improve security, or whatever you want. It's not hard. My friend sold his rural ISP late last year, and he had just negotiated for a 500Mb/500Mb up/down backbone for $3k/month. Each month, they are getting about 10 new customers at $50-70/month. The last I heard, his customer count was about 900, and that was before he signed away financial responsibility in November 2013.
The guy started this company about eight years ago, and was just a network engineer at a hospital when he did. Yes, almost anyone can start an ISP.