well, besides not being able to catch the bus as i start work before they run in my area, consider...
i would have to ride 2 or 3 different buses, and it would take ~1.5 hours to get to work(takes me 20-25 min in my car).
and cost $2 to ride. it only costs me ~$1.75 in gas (granted there are other costs involved) at the current price.
edit: my wife is led to believe it actually takes more like 2 hours to ride.