Lyft prices in the SF/BayArea are $1.21/mile, so just on mileage, I would've paid $36K. Add in the $2/trip base fair, $5 minimum, and any surge pricing or time waiting, and it could add up to $50K very easily, double what I've spent on my car.
People look at $16K for a car or $3k/year and think "those are big numbers", but it turns out that spending $10/day on individual transportation rides adds up very quickly, such that you end up paying way over what the large capital expense would've cost. When I was working in downtown Boston, I did a hybrid car/train commute, and it easily added up to that ($5 parking at Alewife + $2.50 for the train each way) - it was still cheaper than driving, but only because parking in downtown Boston is ridiculous.