Fair enough. You did say that.
As far as I'm aware, taking commercial photos requires the permission of the property owner (the airport authority) and the aircraft's owner.
Entering an airport exclusively for the purpose of taking commercial photos using your PPL ASIC would not constitute a proper use of that card.
Firing off a few snaps while you're there flying is a common activity and I doubt you'd have dramas, as long as your primary purpose for entering the airside area is for flying, not snapping.
For your interest only (I know you're talking about aircraft not terminals) sections 234AA / AB of the Customs Act prevent photographs being taken in the Customs Hall and of baggage searches. I only mention it because
there is nothing in the regulations about taking photos while in a secure area (unless in hazardous areas)
is not strictly correct. I believe it is also dicey taking photos of military stuff and best done cautiously, if at all.