to be clear, it's kind of absurd to suggest that renting out the car you need to get home for the duration of your shift is a reasonable thing to do.
Curios why? If someone wants it for an extra 3 days/nights, shoulder shrug take uber home = more money. Someone cancels, drive to work. Someone has it? Uber = more money. Someone cancels during work, drive home like normal. Not following why this is absurd. I think it would be absurd to just sit it in the lot for 10 hours (2 extra hours since I am sucking up those sweet tips) - or take buses home and have a 2 hour commute?