250 days is mon-fri, with three days off. 250 * 2 * $20 is $10,000. That sounds like a lot, but - it depends on what you gain/lose. If you can avoid buying a car (plus insurance and gas), and live a little further away, in a place that's a little bit cheaper - you can easily save more than $10,000 a year. Uber-enabled at the edge of the city for $1200 / month vs walkable in the middle of the city at $2000 / month, and you're pretty close to break even.

I still took the bus for fixed commutes (to and from work) - when I woke up on time. But uber is very convenient if you're in a city - the population density makes rides near instantaneous.