Maybe I think that providing education to inner-city kids is more important than my new car stereo? Maybe I appreciate all the grants and opportunities I was given, and want to give back? Maybe because as a welfare child in the Bronx, it's only on the generosity of the previous generation that I was able to get a master's degree and work for NASA, making 6 digits in sunny cali with my convertible -- maybe I want other people to have that opportunity, and don't mind giving up the Porsche I want to do so? Maybe I'm just not as selfish as you...