Whilst in theory this makes sense Shooter and fractional ownership is becoming increasingly popular for houses, artwork, yachts, etc, I think with a car it is fraught with potential pitfalls.

Firstly, how do you get 12 individuals with the same view of how such a car should be used, and what happens when one of the guys kerbs a wheel?
Is it a garage queen, or what would the policy be on mileage - would there be an additional charge for this as otherwise how would you equate the ownership experience?
It may work with a smaller number of 'owners', but the basic difficulties are still there imho. Maybe you have thought through these issues and have a solution for them, in which case please tell us more.
Aeroman