Albinos and pieds are pretty commonly kept as pets, and the local petcos in my area are known to sell spiders, pastels, enchis, and the occasional bumblebee (with the bumblebee being the most expensive at 275). Of course I would also throw out that lots of people buying these with the intention of keeping them as pets grow into the BP breeding addiction.

The more expensive genes aren't usually bought as pets, but who knows? There are plenty of people willing to pay 600 to 800 dollars for a dog they didn't plan to show or breed just to get the exact animal they want, so it wouldn't surprise me if there were people willing to do the same for a snake.