Good research QCC2. Very interesting.
The problem is the punters perceive Jetstar to be cheaper and unfortunately alot of them wont do their homework and compare fares.
I have often randomly checked QF v's Virgin on a SYD-MEL flight and we (QF) are often cheaper. If you were to ask the average joe public who is cheaper hands down they would say Virgin.
Its all how we are perceived in the market place. Shame really.