[giantrobot]

Compared to the cost of driving that five miles, parking, tolls, etc that's not that expensive. If you're taking BART to work and back every work day that's $200 a month. The Bay Bridge toll is $7 IIRC. Then you've got to find parking in downtown SF. Street parking is a crap shoot in 1) finding a spot and 2) not having your car vandalized any given day and a paid lot of space is likely to put you over the $10 round trip BART cost.

San Francisco seemingly hates car commuters and just about every aspect of the city demonstrates that fact. Commuting on BART for work is downright cheap compared to driving.