[Van down by the river]

I agree with Delphinus,
I think inbreeding is an issue, plus as hobbyists are so happy to succeed, they don't have the heart to cull. A local hobbyist may not have perfected their techniques and feeding as much as say ORA or CQuest. This may lead to coloration and health issues. The uneven banding can be due to the fact that they reach the market at an earlier age. I also believe that captive diets may have a slightly slower growth than their wild "cousins".
I sometimes see mis-shaped jaws on captive. It doesn't seem to affect feeding and may balance out as they grow and mature.

The reason may be that the person doesn't want the attention. I've met many breeders that keep them and their techniques to themselves.