>I've heard other brands do this (Ferrari?)

It's called relationship-based allocation or more simply purchase history requirement, and its practiced by both Patek and Rolex but add to the list famously Hermes, Bugatti, high jewelry from VCA/Bulgari etc, getting access to prestigious artists at galleries, etc.

The devil's advocate/ other side of the coin is that it's not just a moneygrab, it protects the brand image by controlling who is seen wearing / using your products. When the value of these goods is so influenced by who else has them, that kind of control is intrinsically important for the seller.