Another peculiar observation with regards to taxes for CBR-SYD-LDH:
For paid booking, the taxes come to 134-184AUD depending on the chosen fare as this figure includes GST.
For redemptions, it's still 120.31AUD, even though the GST component should be around 40 dollars less. The same flights through AS quote 84USD.

Icing on the cake? QF do not publish through fares to LDH ex-CBR! So the quoted fares are combinations of CBR-SYD and SYD-LDH fares!