While I could not see putting a creature down just because it is flawed in some way that did not prohibit it from general life type activities, I don't think it would be an animal I could sell as a breeder if I knew it had it, but then again if you are breeding 50+ snakes a year do you really have the time to sit down and really study each one for mental or balance type abnormalities that can only be seen a couple times a day? IMO if you breed animals and breed something that you know has a possible genetic abnormality you should be ready to take care of the snake unless care of the snake requires extreme measures, like it can't swallow its food! If you do sell one you should make sure the buyer knows up front that he is possibly getting a genetically flawed snake and that snake should only be a pet and not used as a breeder. Then again you get back to the large breeder with 20 or more clutches a year they don't really have time to deal with a lot of pet snakes!