When is a good idea a good idea...only if it comes from corporate America?
http://www.kent.gov.uk/roads_and_transport/getting_around/travel_by_car/car_sharing/zipcar_car_club.aspx
I suppose if it works out as cost effective there's no problem. The question of; Who is responsible for:maintenance/insurance/refuelling etc. does mitigate against more community or casual arrangements.
Ignorance is bliss, bliss is happiness, I am happy...to draw your attention to the possible connectivity in the foregoing.