Haha--I find exercise bikes to be incredibly boring.
I couldn't afford a car or insurance and all that until I received my inheritance when I was 23. Until then, I rode my bike and/or took the bus everywhere. Exercise bikes, to me, were like "why would I bother? That's all I do!!!" It is a GREAT cardio workout, though--I can see how hard it is when I peek in the window during a spinning class at my gym. I just can't bring myself to ever be in a spinning class. It wouldn't be fun for me, and exercise should definitely me a little fun, if not a lot.