I've always wondered if there's too much inbreeding going on with some of these morphs. If this is true, deleterious mutations might become 'connected' with the morph genes on the chromosomes. This could make them just less likely to thrive. I've never seen it in my own collection, and I have a good handful of snakes carrying one or both genes. I do have one albino het snow that has had a bit of a regurge problem in the past, but she's been better and is gaining weight again. If we all are careful about outbreeding our stock, any problem should diminish over time.