Probably not, but then again, it's the Government and they have said we must have ASICs if we want to fly into particular aerodromes.
The system, as defined by the CASA, has been put in place to enable organisations like RA-Aus, GFA, HGFA, ASRA etc etc to act in administrative duties on behalf of the CASA.
You are not obliged to join in order to fly and register your aircraft, you can go to the CASA to do that and fly with a VH rego and PPL. It is merely an alternate pathway, one, if you choose to follow, you comply to the requirements of the organisation.
That's why membership with RA-Aus is voluntary.
Chris