The logistics of storing aircraft in AS don't seem to stack up to me. Maybe it's the low storage cost that makes it attactive. It's a long way to anywhere when you want a replacement wing.
Even with Australia's cheap road transport (as compared to the U.S.), the cost of transporting a wing to a major maintenance facility would be sizeable.
Then there's the temperature extremes. AS has recorded -7.5°C and around 48°C maxima. Severe morning frosts are common most days between the middle of May and late August.
In 2001, the rainfall was 741mm for the year. The average is 286mm, but that average can vary amazingly from year to year.
That graveyard rent would have to be peppercorn rent, to make the deal attractive.