I fell like chiming in. I am relatively new to ball python breeding. My son's interest sparked my interest. We have exactly 3 normal females, 1 male fire, 1 male lemon pastel, and 1 female pinstripe.
After much discussion, we decided to not purchase a spider, even though bumble bees were the original inspiration for my son's interest. This was due to the wobble issue. I couldn't reproduce that with a clear conscience realizing that every animal I produce is in existence because of me. I don't care about the percentage of probability. I don't care about profit potential. I don't want to see an animal wobble or spin because of my own desires to produce something I think looks cool. I will not be working with any caramels for the same reason. I do not know enough about the ultramel to say anything other than it is completely out of my price range. Both are beautiful and I wish there wasn't these kink issues. I'm not in it for the money, and I couldn't do it knowing in advance that there is a good probability that there could be issues.
I just thought some prospective from the purely hobby end might help with the business end prospective. If I am out of line commenting here, please disregard.