The Aerorescue pilots probably regard ANG a a temporary option to get some jet time and move on. A year or two up there and then the field opens up considerably in the international job market. With QF new joiners spending seven years in the jumpseat and no sign of any new recruitment, and a seniority list at Virgin that offers the real possibility of the right hand seat for the rest of your career, ANG might not seem too bad an option.
With no career expectations or loyalty involved, a purely business decision can be taken to do a couple of years, get 1000 hours and move on. ANG management have decided to get rid of their expats and they are already leaving enmass for jobs which they may not have been qualified for before they joined.
In these circumstances why not grab the chance for some career advancement, which is sadly lacking in Australia ?