I absolutely agree with that. However...
I think it depends on the breeder. I am sure some breeders do segregate, usually the smaller breeders who actually care about these kind of things. That said, I believe larger breeders are more than likely doing one of two things: 1) lumping them all together because it takes too much time to segregate them out or 2) lumping them all together because they are their specific line and that alone makes them better regardless of quality. And that latter decision is a slippery slope because then the person who buys one of those animals more often than not perpetuates that screwed logic.
In the end it comes down to what everyone says: Only buy it if it is quality. You are the one who has to determine what that quality is... It will be different for everyone