I don't breed snakes yet but within 2-3 years I will be.

I having nothing against culling animals when neccesary. If I end up ever producing an animal that simply doesn't thrive and has no "will" to do so it will end up in my fridge and then my freezer (and I'll probably cry like a baby when I do it).

As for selling animals with obvious defects (one eye, no eyes, minor- severe kinks) it is a very poor practice indeed. Even worse is they are offered cheaper making it convenient for irresponsible breeders to buy. I believe animals like this should either go to a good friend who wouldn't breed it, be kept, or be put down. By selling animals like this you are only risking it being bred by someone.

Spiders are an interesting one. Imho, a bit of wobbling/tweaked behavior is to be expected but I would never breed a spider who consistently shows me extreme wobbling, corkscrewing, spinning.

On a side note- I see nothing wrong with cutting eggs once one has pipped. The snake's will come out when they are ready on their terms.
I cut when I feel like it's safe to cut. Normally that is day 50-52 or so. I make a small flap in the egg. I get to satisfy my curiosity by seeing what is inside. I then put the eggs back in the incubator. Around day 56 or so I cut a larger opening. I haven't noticed anything drying out or babies that are small or dehydrated. All of them eat and shed normally. If I had concerns, I wouldn't do it. Cutting an egg correctly is not going to keep the animal from absorbing any nutrients. Trying to reposition an animal in the egg to see pattern or color or generally messing with it could cause problems. I think everyone should do whatever they feel comfortable with. If that means waiting until the first one pips, that is great. If it means cutting at day 48, that is cool too. I certainly wouldn't condemn someone for doing it. Where I draw the line is cutting and forcibly removing a hatchling from the egg before it's ready. If my egg cutting makes me a bad guy in someone's book then I believe they haven't looked around enough or read enough threads and seen what a real bad guy looks like. Someone who sends sick or poorly packaged animals. Someone that sends empty boxes or completely scams someone out of animals or money. Those are the bad guys in this hobby, not someone who cuts an egg before an arbitrary day, whether it's 54, 56, 58 or 60.
I agree 100%!