My next DONE5 has just been ticketed by Qantas

AUD 3,769 Base Fare
AUD 751.75 Taxes and Fees
AUD 390.40 Carrier imposed charges
AUD 4,911.15 TOTAL (approx. USD3,700)

The travel agent I used in Australia charged me a AUD241 service fee

And by the way everybody - the agent who did this said that QF commented on how cheap the fare was and that "something will have to be done about that".
It might be wise to purchase sooner rather than later