That is the perk of being the breeder, the best animals go back into your herd. And by best animals I mean best breeding stock, aka best genotype, which is not always the same as best phenotype. For example I was at a state show once where the Grand Show was sold. He was a very nice looking animal and was owned by a breeder who does not normally sell animals off the top of the table. Later that day I heard the breeder of the animal comment to a friend that the animal in question was a freak, who popped out of two of his worst lines and would never produce anything good in breeding. So the person who bought that animal that day may have thought they got the good stuff, and did get the best phenotype, but the genotype of the animal was questionable at best, and when it comes to breeding it is the genotype that matters, a heterozygous mess is not gonna produce quality consistantly.
If you think that breeding mean spending as much money as possible for "perfect" animals that will then produce more perfect animals you shouldn't be breeding. A good breeder needs to find good breeding stock, knowing it is good, not great, and knowing that it needs to be improved. They then need to gain the knowledge of genetics required to make the proper crosses so that a percentage of your offspring will be better then their parents. That percentage of animals are now your best, that you will put in breeding instead of selling.
