I can see your point in presenting some models with the right size/weight and no movement.
We see this everyday in mobile phone stores.
Still every time I see this it creates a bad feeling as if that company (be it Apple or Samsung) is not able to sacrifice a few phones for people to try them in stores.
In my opinion such an action would hurt Rolex image more than help.
Showing an empty display (or not for sale ) shows your product is in demand.