$199/day sounds very interesting.

The question is: What would be the weekly rate? :-)
If there was a little discount on the daily rate, that would be my offer of choice when going to California for 3 weeks.

So that's several thousand dollars earned (minus commission of the shared ride website) right there... :-)

BTW: Currently, it's so difficult to get the Model S as a rental car. It would be great, if there were more options out there...