This question hit me today as I was just doing my usual browsing on Morph Market. There's something surreal about the fact you can get the longest snake in the world just, delivered to your door, and all for a couple hundred bucks if not even less.
I know they have a sizable morph scene which always boosts any given snake's popularity, but there's got to be more than that because I find it so strange that an animal that is (or at least should be) beyond the care capability of most people is so common in the trade that I even see some regularly pop up in local classifieds, where you're lucky to see more than the usual 3-4 beginner species at any given time.