turning a 4 hr flight int a 10 hr mission and going through 2 international borders doesn't really suit everyone , however your idea may work although i think its Australian airport fees , levies and taxes along with Qantas's penchant for the big rinse that elevates domestic prices to that extent.
little syd and her fella have been train hopping around Europe for the last 5 weeks , having a great time .....imho there his a clear and obvious agenda to make people question flying as a means of travel ......for instance $178.00 one way to Bali from Perth or Brisbane but a return flight...