What are the taxes, fees and port expenses included in my cruise fare? Why do we charge them on cruises, including domestic cruises?

Taxes, Fees & Port Expenses includes taxes, fees, charges and tolls imposed on us by governmental or quasi-governmental authorities, as well third party fees and charges arising from a ship's presence in a harbour or port. This may include GST, Australian or New Zealand Customs fees, Australian Passenger Movement Charge, dockage fees, wharfage fees, inspection fees, pilotage, immigration fees, as well as fees for navigation, berthing, stevedoring, baggage handling/storage and security services.