Why payback doesn't matter as much as you might think

People often ask me what the magic Payback number is for residential solar.  I used to make what I thought were educated guesses, but after talking to hundreds of homeowners interested in going solar, I am convinced that the answer doesn't actually matter.  In fact, I'd say the question doesn't even matter.  I think Brian Keane knows what I'm talking about.  I recently found one of his articles titled "Policies that advocate for solar consumers will create jobs".  In the article, he points out that "without national policies that benefit these solar consumers, their...