Maybe the lesser was an exceptional example to the buyer, or the breeder seemed a bit more reputable, or he/she had more weight, or was promised to be a good eater, etc, etc, etc.

AKA, an item/animal is worth what someone will pay for it and always will be. And if the seller was just a smooth talker and the buyer really was ignorant... well, to be honest, "a fool and his money are soon parted". I never buy anything without researching...