Another trap for young players - under the previous 1988 Civil Aviation Regulations CASA decided if you were required to operate an aircraft in the course of your business you must hold at least an Aerial Work AOC.
An example was a photographer (from FNQ from memory) who was prosecuted for using his aircraft to take aerial photographs of properties and then selling the photos, with a private pilot license and no Aerial Work AOC.
I'm not sure whether the current Regulations have excluded the possibility of this bureaucratic insanity recurring.