Your wife may have a harder time accepting and adjusting to your spending more time at home in Australia than the financial aspect of ER.
I can totally relate to your wife. In the summer I work out of our beach house while my DH works in the city on weekdays. We only see each other on weekends. Boy do I enjoy home alone! Every Sunday evening I find myself actually looking forward to sending him back to the city.
I'm not saying your wife doesn't enjoy having you around. It may just take her a while to make the adjustment, both mentally and financially.