I respect your feelings about spiders. I think they are a beautiful morph and people who breed them and like them have that right.
I just don't want a pet that *could* corkscrew and writhe around at every feeding because of excitement- even mild missed strikes or clumsy positioning - it makes me sad to watch. We say they are fine and non-painful, and whether we are right or wrong in that I don't know - but the ability and willingness to eat and breed does not equal QOL to me personally.
I would not own a blue pit, boston terrier, bulldog, or dachshund, and sooo many other purebred dogs for the same reasons. 95% are perfectly lovely dogs with some minor issues that are completely manageable and that don't effect their quality of life at all, others develop the worst chronic skin /allergy issues / neurological problems that do affect their QOL - and you don't know which will have these issues when they are puppies...all pets have some risk involved, I'm just minimizing mine as much as possible in this respect.