This is a great question!
I haven't had a snake die on me yet and I am not looking forward to the unfortunate day I live through the experience. I sincerely hope I will keep all my snakes until they get very old and that they have long healthy lives.
That said, would I have the skin preserved if one of my snakes should pass? Surprisingly I would think I would. I personally think it would be a nice way to preserve something of an animal I loved for so long. I would even display it in my home if I could arrange it in a way that I liked.
Some may think it morbid but as long as it was not the reason why the animal is dead, I see nothing wrong with it. I would have it done by a professional, I could never even think of doing something like this myself to any animal, especially one that's been my pet.
Keeper of 5 snakes, leopard geckos, 1 green iguana, 20+ tarantulas, 2 dogs & a bunch of rats!