Bicycles are great fun. They can bring a smile to your face and make you forget the drama at the office or in the kitchen. Riding one also makes you healthier. And then there's the environmental aspect, small carbon footprint, reduced dependence on foreign oil, fewer armies of empire, etc, etc. But what may just get the most people on a bike is the financial incentive. $300 vs $8000 a year to own & operate compared to a car.
That math is in our favor!
Here's a link to a great posting by Addison Wilhite in Reno. He makes a good argument, you should read it!