How would the possibility of disease spread be addressed? What's to stop joe blow from bringing in a snake infected with IBD, Paramyxo, or any of the other fatal goodies? They may not even know yet that their animal carries some of those, but it can still be spread to other animals. That's a legitimate concern, or should be for anyone who does truly care about their animals and their wellness.
I can see how people might find this sort of thing fun, and if someone can come up with a way to run it safely more power to you, but I'd stay as far away from something like this as I could get. It's not worth the possibility of wiping out my entire collection because of another keeper's negligence. And let's face it, negligence and ignorance are out there.