>Early adopters of solar panels tend to be people who are interested in innovative technology, who find an installer they trust, and who think having solar panels will benefit them.

I'll bet early adopters of solar panels tend to be people who calculate the fuel economy of a car before making a purchase decision, people whose, damn the paperwork, ears perk up at the idea of a rebate whether from a corp or the govt, people whose enjoyment of a bath entails thinking about how cheap the hot water was.