Certainly that is an obvious use of the non-active register, I have used it that way myself when there was some fault I thought might be genetic. However it's clear to me that the overwhelming majority of kittens sold on the non-active register are registered that way because the breeder either does not want anyone else breeding from her kittens or because she wants to be sure about any potential breeders first or simply because she wants more money to sell a kittens for breeding. In other words it's less about how good the cat is and more about who is going to be doing the breeding.

Lzi