agree with the physiological aspect of your post. To say that cycling takes less special genetic talent than swimming or running... I wouldn't put it this way. With Swimming you need more time practicing the biomechanical movements to become efficient.
I think it has to do with technique. Although cycling consists of some technique, you are using a machine which is equal in efficiency for everybody. Of course, your pedal stroke influences the efficiency, but not that much when comparing with swimmind and running. In swimming, it's you and the water. Technique is so important.
Also, keep in mind that in cycling you have all this equipment. Interesting, fascinating, and addicting all at the same time. Most triathletes (me included) spend more time on the bike because it is more interesting. Of course one can argue about that one but I think that this plays a role as well.
�The greater danger for most of us is not that our aim is too high and we miss it, but that it is too low and we reach it.� -Michelangelo
MoodBoost Drink : Mood Support + Energy.