I just wanted to quickly interject this:
Spider wobbles are generally accepted by the herp community as "not bad enough to prevent breeding" because - - - Not only do they "just survive", but they THRIVE in captivity. They eat well, they grow, they aren't any more susceptible to disease, and they BREED.
I don't work with spiders, and I am not in the "wobbling is cute" camp, but I'm not going to naysay someone who does breed and sell spiders.
That said, I think it's important for all people who sell spiders to inform every customer of what wobbling is (especially younger customers), what they can expect from the extremes of spider wobbling (or lack thereof), and why if they decide they are fine with it that their snake will likely be just as healthy and thrive in captivity just as any other ball python.