I think that with the animals we are breeding deformities and "defects" are rare. Kinking, duck billing, and bug eyes are all deformities I feel you can sell. Depending on the severity of the kinking maybe sold as pet only. But culling is only done when it's a defect the animal will suffer. It's an unfortunate part of breeding animals the we must accept. I don't feel there is an inbetween where it can't be sold (even at reduced price) and culling. The animal is either healthy enough to survive or not, and we as breeders have a be responsible enough to do what right by the animal, not our wallet.