Also one for pondering.
Before January 2014.
Fly SYD-BNE-SYD. Earn 2,000 points in discount Y, and an upgrade one way was 8,000 points to J.
Then it became 10,000 points to upgrade.
Now it 10,000 points PLUS my earn will only be 1,600 points.
Therefore, 4 return flights to get an upgrade...