Money has nothing to do with why I commute. My coworkers cannot understand me either. On one hand, I am a car guy. I love cool cars... what can I say. But in a perfect world, I would be one of those guys who hoards collector cars, but never drives them. It drives my wife nuts. I didn't want to drive anywhere today because I just washed the car yesterday.
Anyway--- I look at my savings as health savings. I wish I lived further from work so I could get a better workout, but generally in the summer I will take "the long way home" to get more exercise.
I spend more money on clothing, bikes, parts, tires, extra food, etc.... than I save in car related costs.