TBM
"fools gold"
I think that is a very apt description of what the ADF always seems to be chasing with purchases.
Again 18 vs 22, so they thought they were getting more for the $, of course it doesn't matter if it was 5, 10, 15 or 20 if non are combat ready.
Sounds like someone in the Euro sales team picked the Aussie hot button that would get them over the line - a few more aircraft - and the Aussies fell for it.