Your routinely acquired reptiles are definitely NOT the property of the Crown, they are yours to do with whatever you wish, as long as you act within the constraints of your licence, just as it is with dogs and cats, horse or any other animal. Almost all animals have conditons placed on their keeping, and it has everything to do with public safety and comfort, and the welfare of the animal concerned, and nothing to do with them being 'owned' by the government. They CANNOT be taken from you for any reason other than a breach of your licence conditions, in any state, despite what zealous wildlife officials (or poorly informed members here) may tell you when they are exercising their 'power.'
I have a few snakes, I don't handle them much so I probably get bitten more than most if I'm not paying attention, so I wouldn't call my animals 'pets' in the way my dogs are, but for all intents and purposes they may as well be 'pets' - they are so far removed from being 'fauna' (most are several generations captive bred) that it's absolutely ridiculous to have them classified as 'fauna' and have them licensed as such. With a very few species exceptions, the licensing systems in all states serve no purpose other than collecting revenue and employing staff - and propagating the myth that the various state departments are 'doing something for conservation..."
The exclusion of pythons from import into WA has absolutely nothing to do with them 'belonging to the Crown' (whatever that means...) - it has everything to do with the heavy-handed bureaucracy in that state perpetuating the myth that all snakes from the eastern states are disease ridden risks to the squeaky-clean WA animals. It's a justification that works with many keepers over there, and far easier for DEC to argue than the simple fact that they want keepers in that state to limit their expectations. There are constraints on moving all sorts of animals between states at different times - just talk to your local Ag Departments. It has nothing to do with Crown ownership, it has to do with the many and varied management issues, disease and pest control, nothing more or less.
Jamie