Reminds me of the post on The Verge the other day about $45K 3.3KW solar charging stations that San Francisco bought with taxpayer money. Man, I'm glad I'm not a CA taxpayer, because I'd be pissed. Let's very optimistically assume 365 days sunny days a year and 10 hours of sunlight. That's 12775 KWh of energy, which at $0.15/KWh works out to $1916 per year. That's 23 years before those chargers pay for themselves, and that does not include repairs and maintenance (such as, you know, washing those panels once a year, and replacing broken stuff), AND the assumption is that the batteries generate their peak output through the entire day. So realistically, 50-60 years before you have any chance of breaking even.
This is basically the same thing. It makes no economic sense for 99.9% of its potential users, even those who already have solar.