Sorry to keep coming back to this, but I just thought of something else. Boa is right, there are way more breeders this side of the ocean. The reptile industry is also a bigger money market here than over there. The competion is intense in a market where some animals comand a $100 000 USD price tag. The pressure is on to keep coming up with new things to entice an ever growing, jaded customer base with.
If exotics where open to Australian buyers, then the same competetivness would be on. The market there would be blown open. The flow of morphs into Australia would be steady. As would the oprotunity to cross animals. I'm not saying that profit minded actions are justified, just offering a bit of reasoning behind the actions themselves. In a market where people can make well over $10 000USD for some crosses, you bet there would be people there lining up to produce these hybrids.