There's a lot of things that only has to happen once, but that doesn't stop people from doing them. There's a chance something could happen to a snake by itself, that doesn't stop you from keeping it does it? If you know what you're doing then chances are you'll never have a problem. Having kept multiple snakes together for years without any problems shows that it can be done if done right. Again...just cause there's a chance something could go wrong doesn't mean it will. There's a chance I could die riding my GSX-R but that doesn't stop me from riding it.