This is a peculiar hobby, in that it's also a collection community. We've all got our eyes peeled for the next big thing, and when you're investing thousands of dollars to keep every snake you own in a good quality of life, not to mention acquiring more and brreding them, you want to do it in the most efficient way possible. If there's a way I can have a room lined with vivariums and manage to heat them all properly, wonderful, and I know there are folks out there that do, but racks are fairly inexpensive and efficient, and a definite tried-and-true method.

TL;DR: Ball pythons become an addiction, you have been warned. Heh.