I was attracted to Qantas $700 - $150 AmEx deal and went to Qantas website. The price there is "amazing". When Jetstar.com.au sells $198, Qantas.com.au sells the exact same tickets $487. Same plane, same date and time and same level (Starter).
With such a difference, why would any sane person buy from Qantas.com.au? Here are the screenshots I took at the same moment to show the difference.
Qantas:
http://pasteboard.co/1a9boGtUG.png
Jetstar:
http://pasteboard.co/bDuc3rH7s.png
I have not flown jetstar for ages. Does one get Points and Status on a QF booked ticket flying Jetstar? If so that could be why