I got into bicycling as a result of going car-free. I did the financial math, and realized that owning and driving a car in urban areas was just stupid. In addition, I'm very, very concerned about the environment, or what little is left of it, and decided that I needed to put my money where my mouth is. I tried busing and walking for a few weeks, and, then, frustrated about a late bus, wandered into a used bike shop and bought an old MTB for $75, which I soon modified for city use. It was an instant epiphany. I'm now at least as mobile as I was when I had a car, I never have to worry about parking or traffic, and, in every way imaginable, I'm way happier. And I have a bit more money, too. I'm now convinced that anyone who tries cycling around town will find it to be vastly superior to any other form of transport, at least at distances <10 miles, which, for most people, is a significant portion of their trips.