If you don't mind my comparing apples to oranges, it might be helpful to imagine spider balls as being similar to pug dogs. Some people might consider the short faces on pugs to be a defect because it can cause dental problems, breathing problems and a lot of snorting and slobbering. On the other hand, a lot of other people consider them to be very adorable sturdy little dogs with big expressive eyes, they are very popular as pets and many people breed them.
Spider balls can have strange tremors and twisting movements that at least make them look like they may have a neurological disorder, some can be very severe some are hardly noticable at all, but they all appear to have it to some degree or another. Some people will consider this a defect, but many others will consider the fine spiderwebbed pattern of these snakes to be very pretty and pleasing to the eye and so they are also very popular as pets and many people breed them.
I guess it all depends on your perspective.
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