Im personnally a WISP in Quebec Canada. I install in 2006 some wifi network in Cameroon. And when i return back i decide to offer the service here where is not available or where the service is really poor. I got some village that switch from dsl to me because the dsl service is terrible. I was not thinking make a lot of money on this but it's more a defy then anything. I see some wisp that share their cable modem to offer high speed. You cannot get a good result with this kind of access. Be a wisp is the hardest ISP business. You have to play with the nature of signal , temperature , obstacle and noise when you use public channel + all other problem other isp can confront. If you like trouble start WISP. But for me is perfect. I like trouble
:) and is paid off by the smile of every client i connect.