Most guys would come home for 120k and then fight to increase the conditions. It's better to be on the inside hat in mouth, than throwing stones from the outside.
More than disappointing unless you are suggesting a clever expat with enough taxation credits not to pay tax on that 120K for 5 years + ? Oh yes, right, and fight for an increase in conditions once you have accepted sub-par pay. Bullshi$$.
The difference about being an expat and living in Australia isn't money, it's all the things that you can't actually put a value on.
Yes and no having done both.