My thanks to the Etihad rep for the direct link to the upgrade auction. I've previously always waited for the email.
And to everyone else, I notice the prices are no longer particularly attractive. For my forthcoming flights, to upgrade from Economy to Business:
Sydney to Abu Dhabi - starting bid is $1860
Abu Dhabi to Dublin - starting bid is $870
Dublin to Abu Dhabi - starting bid is $870
Abu Dhabi to Sydney - starting bid is $1575 (note the difference from the outgoing flight)
Total cost would be $5175 which, when combined with the economy class fare, is getting rather close to the price of a Business Class ticket in the first place.
I realise the cost may vary depending on the original fare class, but I expect the total arithmetic reaches roughly the same conclusion.
I think I can upgrade one of the shorter legs with points, possibly also the second short leg on the way back once the points from the outward journey credit to my account. But the long legs are going to have to be Economy unless an upgrade purchased at the airport is cheaper.
IP