Sometimes, its not about the $$$, but about being self-sufficient and reliant on yourself.
go on alternative energy forums and you'll see tons of people who have gone off-grid and never looked back.
Who gives a crap how much KWh costs when you aint getting any power.
To each his own. I have a back up genny to keep the food from spoiling but if I spent 20 hours a week fiddling with turbines, panels and heat exchangers I would be in essence paying myself a buck or so per hour. I'll work a extra hour at the shop to pay for store bought power and use the other 19 hours doing what I want.