I took the time to read through this entire thread from start to finish.
All I can say is that I'm left speechless. Mr. GWI truly did his best, but I think he was fighting a losing battle from the start.
Wi-Fi is a great technology, but for use as a primary connection to the net, I'm not sure it's worth it, unless you have a seriously dedicated and well financed team behind it. At least not in the role of a WISP.
Using a WUG as an example, it's growing slowly but surely. From what I understand, the connection is pretty strong, and doesn't suffer from the same problems as this WISP does. While they are not providing internet, the design of the WUG seems to be more robust and stable, and if they were ever to link up to the net, I think speed and quality wouldn't be a problem.
I complain about the ADSL here at work, but the truth is that it has been stable, very stable. Some downtime yes, but in general it has been well worth it.