That's as may be, but when you drive a car a few thousand miles, sometimes you ding it or someone runs into you. Rental car companies charge you for every day the car is out of commission, so your own insurance won't cut it. But if you get their insurance, it pushes it from the $30-$50 a day range to the $70-$100 a day range. Make it 5 days and we're at $500, double your number. But then you also probably have to get a Lyft/Uber to/from the nearest rental car center, typically an airport, rather than driving to/from your own home - add maybe $80. And you'd best pony up $10+tax a day for any additional drivers, because if you don't and they get into an accident, your insurance won't count - oh, and they have to come by with you to sign the rental agreement. Oh and did you say you wanted to rent at Thanksgiving? Say hello to surge pricing, taking you from $500 to $1000-$1500 - if they have a car available. And all this only applies to cities - in small towns you're screwed anyway. In theory this is a good model, in practice it's highly restrictive. I have a hybrid SUV, I would love an electric, but I'm gonna wait until the value proposition is there - 300-400 mile range and widespread superchargers.