> First of all, what kind of insane person pays $5k for parking and insurance?
> My parking expenditure (yes, I live in SF) is maybe $10 a week
"You'd have to be insane to get the unusually low rate I get on parking!"
Please tell me this is a joke. This is as dumb as saying "I can't believe people let themselves get so ripped off on their rent: I pay $900/mo to live downtown under rent control, why don't they just do that?" For some actual data instead of nonsense like what you're saying, look at something like: http://sfbay.craigslist.org/sfc/prk/
You can't really find a parking spot for less than $250 (~$62/wk). I expected this to not be the case in some outlying areas, but it looks like you have to go all the way to Glen Park to find parking for cheaper than that. Parking that comes with rentals is cheaper (about $150/mo generally), but not everyone has that option and I'm sure you agree that it's idiotic to say that you have to be "insane" to happen to live somewhere that doesn't come with a parking spot option. Either way, parking is 3-5x what you seem to think it is.
> As to gas and maintenance, you obviously pay those for an Uber car just like you pay for it for your own car -- in fact, you pay more for these mileage-related costs, since the car has to drive over to you as well as drive you wherever you go.
Your math is wayyyyy off here. You pay a minuscule fraction of the insurance costs for an Uber: largely because you're paying in proportion to your usage, and all the times that the car is parked or picking up other fares is not your responsibility to pay for. By contrast, even if you drive the exact same amount you would've Uber'ed, you don't get to tell the insurance company "I only drove 3 out of every 24 hrs this week, so I'm going to pay you 1/8 the premium". TL;DR for this paragraph: You seem to be completely forgetting the fact that insurance (and maintenance) related costs are driven down by increased utilization, and almost by definition an Uber has infinitely higher utilization than an owned car.