Come on...
As someone who has lived in Russia, where the selling of your grandparent's kidneys would attract praise for craftiness rather than condemnation, while I would accept that business decisions are made almost purely on a minimum-cost-for-required-outcome basis, is there no room in these decisions for the human element?
Hell that is what people generally like about Australia - where people get a fair go. That the work was subcontracted back to Sunnyfield suggests that there might have been more to it than money and we'll never know most of the details, but...
at the very least Qantas should realise that decisions like these, if exposed in the media, are somewhat damaging to reputations, and act with a little more forethought.