Earlier quoted context omitted.
In SF, Uber pool rides are cheap ($20 can usually get you anywhere in the City, and shorter distances at off peak times are often under 10). Compared with just cost of parking which is easily 300+ a month at many apartment buildings and only a piece of the cost of car ownership, commuting via Uber/Lyft actually makes economic sense.
If the average is actually $20, two rides a day (working day) are $800 i.e. more of the $700 calculated above. If both rides are around $15 on average, than you get an afvantage.
In which case owning the car is a no brainier because of the personal freedom and massive amount of inconvenience it affords. If you want to go on a road trip or eat taco bell at 1AM you can do that for just the price of gas (though you probably shouldn't do the latter because odds are if you want Taco bell at 1AM you're also stoned out of your mind and unfit to drive).