We had quite a few wealthy business men try it on too. In NSW and Vic they got exemptions to fly in and out of the country and continue doing business but the rest of the country locked down.Yes that kind of weak link will compromise the whole effort
We had a wealthy mining magnate that got upset when he discovered he couldn't return to his home state of WA without going through 3 weeks of quarantine. He was so angry about that that he tried to sue the WA government and the Federal government and he started his own political party as well. Didn't get him very far though.