Mach 85 is correct with a caveat - a lot but not all of the Aussie RSP based guys, are on LOA from Qantas, so for them it is a money making exercise (while the rate of exchange works in their favour) with an exit strategy already planned..
For the rest, who don't have that luxury (LOA), the unrealized potential and silliness of how things operate, add an additional layer of stress on top of that for loss of medical risks, draconian punishments (lightening strikes etc)
(This Delta Crew would have been severely punished
Delta plane hit by lightning - CNN.com)
and training... Where to start? And you have many frustrations, including the fact that A320/737 jobs in China pay more as MACH suggested..
To be fair some of it is on the CAAC, who are run by sycophantic apparatchiks, who have no understanding of what a pilot actually does...
Anyone care for a cigarette?