Honestly, this is a good thing. No one should be buying mechanical watches as investments expecting them to be appreciating assets. This shouldn't hurt Rolex, Patek, AP, VC, etc, as there's plenty of demand for their products and they're not selling them on the secondary market anyway. If it does end up hurting them, it's only because they allowed their ADs to participate in all kinds of shady behavior that ultimately drove up the secondary market pricing.