Having just gotten my first scooter, I will say I ride mainly for fun, though there is an undeniable utility/economy to a scooter. Seeing as my other vehicle is a full-sized SUV that gets roughly 12/14 mpg, it is FAR more economical to take my scooter to the gym, grocery store, etc., than it is to drive the four-wheeled conveyance. That it happens to also be a lot more enjoyable is just icing on the cake.
Here in Pennsylvania, and a lot of other places, two-wheeled vehicles are a luxury for all but the most hard core (many of you on this forum fall into this category) who happily ride scooters in all weather and temperatures. For me, it's about enjoying the warmer weather, feeling the wind, the joy of working the throttle in the corners, etc.
I will say this: I recently purchased my first two-wheeled vehicle, but I will be surprised if it is my last.