think ya did answer your own question. but at the same time it's each to their own. everyone buys a snake breed for a different reason. but care and size of the snake has to be a major issue. no good buying Burmese or retucs if you havnt got much room I guess.
I got a royal as my first simply as I love her markings. I think royals are gorgeous. I am how ever eventually going to get a Burmese. which will most likely be a albino. ( once I convince the OH lol) but not cause of the size it gets just simply as I think they r gorgeous.
but from what I've seen so far I would imagine for most people it's the fact there are thousands of morpths and don't take up much space