Like I said, I was just asking to try to understand. I am not going to tell anyone they shouldn't sell them for that. I was just wondering if there was a reason why.
That makes sense about uncommon quality. But how do you know if an egg is going to possess uncommon qualities so you know whether to pay more for it? By looking at the parents?
Parents, grandparents, etc. Buying eggs is still a gamble though, you could still have chicks with problems such as crooked combs, color leaking in the wrong places, etc., but the best breeders have worked on removing those issues from their lines so your chicks will have a better change of being high quality.