My mate has just finished working for me on £40K per year and is moving to Perth Aus on £178K per year for a similar job working for the same company.

Cost of living down there is very expensive. There is no apple against apple comparison.

Off the topic a bit but interesting to look at that list- neither rugby code seems to have any real traction in about 40% of those places (if some of the periphery), and limited in two of them I'd argue.