It's not only cash spend directly, it's also time spend. I was spending 2h a day in public transit, but when I tried to do it in car, it came down to less than 45 minutes a day. The parking was quite expensive so I doubted, I was paying 150$ a month for my public transit pass, but the closest available parking would be 250$ a month. Lets round it up to 1h a day and say that a month is 4 weeks, I was spending 20 hours a month. For some absurd reasons, I wasn't considering my time stuck in movement as part of my job hours. By refusing to pay for the parking, I was essentially saying that my time was worth 5$ an hour.
This is so weird that we all forget that our time lost while we go to work, is still part of our work time. Spending 2h a day in transit, that's accepting a 20% pay cut from the get go.