VH-JJW,
As one of those pilots working in a far flung corner of the globe, I can assure you I would be out of here in a heartbeat if my current country of abode could supply sufficient home grown pilots. That is the situation ANYWHERE Australians are working as ex-pat pilots. It is NOT the case in Australia.
There would be a flood of highly qualified, experienced pilots coming back to Aus if J* and was offering anything close to a competitive package.
457 Visas are supposed to be a last resort when sufficient numbers of qualified Aussies don't EXIST, not for when a company simply won't offer any thing like enough money!!