Always an interesting debate this one, but as said, it's horses for courses! The money on offer o/s is extremely tempting, but compared with lifestyle choices in Oz, it's obviously a personal decision.
The Oz aviation scene would be most interesting if CX, EK, SQ, etc.. all set up aussie bases, then we may see the Oz airlines treating their drivers a bit better!! A 777 slot in EK would be irresistable!
Personally, nothing beats the aussie beaches, mates and weather, although the women could be improved on!!!