What this would essentially do is create a new vehicle on one brick for every client that activates it (event wise).
So if more than one person wants a certain car or vehicle, they can create one for themselves. But only one.
(perhaps an RTB setting)
I just don't know if making a vehicle brick spawn more than one vehicle is particularly possible. But if this was in some way possible, I think it would be neat. No more "Aw stuff, there are no more (Vehicle Name)'s left."