I think the probability of success in shipping depends a lot on the genre of the model. Car models are quite robust, ships are quite vulnerable to damage. Other genres are somewhere in between (I assume figures would be pretty robust. Even within the genre, it may depend on subject. I assume WW1 airplanes would be more susceptible to damage than modern jets, for instance. It is the small parts sticking up off the model that seem to be most vulnerable- antennas, pitot tubes, and such.