Which begs the questions, especially given the savings you identify, I wonder how much money they would be losing if they hadn't set it up?
The wet lease doesn't need to be operated by a wholly own subsidiary, just whomever can do it for the best fixed price on a rock solid service quality contract. Possibly more like Cobham then, but IMO Qantas also needs to get out of the business of capital ownership when it comes to aircraft (doesn't it still own the B717s), so beyond staff - the lessor needs to supply all equipment and maintenance (which it should be able to do on substantially better terms than Qantas is able to do by itself in Australia): Is it not "return on capital" where QFi is unable to provide a satisfactory result, and needs to apply some radical out of the box thinking?
I think that wet leases are a better option than relying on codeshares, where important elements of quality control over service and branding are also handed to the partner. And multiple partners means inconsistencies in passenger experience. (IMO this is a major problem with VAi's approach.)