If my utility is going to sell me cheap power at night and buy it back from me during the day for more than I paid for it, that sounds like free transportation.

What good does it do me, however, if I'm left stranded at work because the utility has sucked my battery DRY during the day? I'm sure they'd be HAPPY to sell me expensive power at super-peak rates, to charge my batteries to get home.

This sounds a little dodgy. Thankfully it's not something we're going to have to worry about for years, yet.