I think when people give the "don't buy that animal, it is a poor example of its morph" advice, they mean 1 of 2 things (altho they may not type it out fully, this is what I believe is in their head):
1) - Don't buy that animal FOR BREEDING. It is a poor example of its morph and thus it is likely its offspring will be poor examples of the morph as well.
2) - Don't buy that animal (let's say it is a pastel) IF the reason you want a pastel is because you love the bright yellows. It is a poor example of its morph and thus it will brown out soon and won't have the bright yellows which are what you want.
I believe both of those, when you look at what is really meant rather than the abbreviated version that is often all that gets typed, are very good advice.
As far as your statement that having a top notch animal doesn't guarantee that every one of its offspring will be top notch: yes, that is true. There are no guarantees. However, it has been proven over and over again throughout the history of domesticated animals that selective breeding does work and is in fact a very powerful force. Just look at the huge variety we have in breeds of dogs. And if you breed a Labrador to a Labrador, you will always get a Labrador, not a poodle nor a St. Bernard. There is already plenty of evidence so that I think it is safe to say it has been proven in BPs in particular as well as animals (and plants for that matter) in general. So while breeding with top notch animals does not guarantee all offspring will be top notch, it does, on average, raise the quality of the offspring you produce.
As far as what to do with those animals that are produced that are less than top notch, as has already been pointed out, there are plenty of ways to get rid of them that don't involve culling, so I don't really see an issue.
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