Lies, damned lies, and statistics, and then there's people like Band a lot.
Australia has a Bizet fleet approaching 200 which puts it in the top 10 operators of corporate jet aircraft in the world, more for instance than France, Italy, or Japan. The only countries with substantially more biz jets, are givens from North (US, Canada and Mexico) and South (Brazil) America. Sure, we're minuscule compared to the States, but so is everyone else.
If you can get your hands on last Septembers "Australian Aviation" magazine, there's a very good assessment of the status of the Australian corporate jet scene.
One thing that is of note is that Australia has a high percentage of mid to large corporate jets, the ones that you no doubt aspire to.
Good luck