Are you sure? I had a local callout to a shop a while back and there was a fee. Melbourne metro area.
As far as I'm aware you are only charged for false alarm callouts. Ambulance on the other hand is charged unless you have membership, and is around $1000-$2000 for a short trip to hospital, they will still charge if you have private insurance, you just have to pass the bill to your insurance yourself. Beware of state membership if you are a pilot, as it may not cover you interstate.
As far as airport fees, not sure many operators there would call $1000/year chicken feed. Its about $3000 per year now if you pay yearly, and $9 per landing, Airservices additional, also the figure is per ton. The locals would love you increasing their rates that much in one go.... I'm pretty sure if Airservices could make a buck out of fire services there it would be there already.