Well, if it's fiberglass, it is good to have the bodykit (unpainted) on the car for a bit so the kit can settle in and have a "perfect" fit before it gets painted.Why do people install unpianted body kits and drive around with them? Isn't easy to send it to the shop to get painted without having to send the whole car?
Who cares right? It's their car, their money, they can do wahtever they want. As long as the person is happy with what he/she is doing, it's all cool.