The reality is the RAAF share that airport and they don't own it, the Australian Government does, the RAAF are merely tenants. Therefore the government has a vested interest in making sure their jets don't run into any sort of civilian aircraft at 600kts with an under trained and over worked RAAF controller directing traffic. Other than for a bit of sport I can't see any reason in mixed traffic that a fighter needs to be doing Mach stupid in the TMA.