Why are scaleless bp's so rare?

[Bogertophis]

Brought back to thinking about this topic yesterday.

Chris Hardwick just posted a video where he cut eggs from a scaleless head x scaleless head clutch.
The scaleless egg did not pip and in fact, the snake was still in the fluid sac. He cut the snake out of it himself. I think this may have been due to the scaleless babies not being able to produce a proper egg tooth to cut out due to the scaleless gene. This can lead to egg deaths if not caught in time.
I wonder if Chris hadn't gone back to check if it was alive and cut the sac open if the baby would have drowned.

Another issue I came across is that these animals tend to constantly be in shed cycles due to the self caused injuries just by cruising about in enclosures. Someone else mentioned they have less effective heat pits and feeding can also be an issue.

Excellent points- I do think the "egg tooth" is part of the scales, & thus is likely to be absent in scaleless snakes. I personally think it's sad to knowingly breed for defects that are counter to their survival.