I don't have space or money issues, I just have never seen a need to have more than one bike. I only have one car too, and if that breaks I'm in a lot more trouble than if the car breaks. There's nothing on the bike that I can't fix myself in a max of 3 days (shipping for parts), and I can carry it home if it breaks.

To date my bike has been unrideable for 4 days out of 8 years.