First, I didn't think the authorities looked kindly on hybridisation. I understand it's illegal in most States - even those which have set up categories for them (just in case). Who can say that at some point the authorities won't clamp down on this, and in the process go too far and restrict our hobby beyond where it is now? Those of us who have been involved for long enough can remember busts over very minor issues (even outside WA, where I live) and amnesties that ended up being revoked and people being threatened with prosecution. Our hobby exists thanks to the laws in place - we flout them and we risk an unknown penalty.
Second, where does it stop? I've seen hybrids of carpets and womas (comas) and all sorts of other cross-breeds on other sites (in other countries) which wouldn't interbreed in nature. Some, like the jag-type morelia shown earlier, are indeed gorgeous. But lots aren't, and what happens to them? For mine, the mad-scientist approach is just that - mad. Yep, love the look of the some of the animals produced, but for mine that in no way justifies the process. Keep 'em pure.