The place it gets tricky to me is that snake hybrids are usually fertile. If they are represented as hybrids and any offspring are represented as hybrids then to each his own. Where I would consider it unethical is if hybrids or their descendants are misrepresented as being of pure stock. I can picture some jackass (hybrid!) passing off F2 or F3 hybrids that look like one parent species as pure just to make a buck. Or maybe getting big bucks for a new morph that is nothing but a mutt.
Some of the hybrids are quite beautiful. They aren't my thing.