I can't see how Jetstar could use the cadetships to raise revenue?
The money goes to CAE/OAA/Swinburne, not Jetstar.
Even if jetstar aren't making money off them, they get a cheap source of pilots as they are able to pay them on the junior first officer salary for a couple of years (if what a poster a few pages back is correct. I still need to call the union to find out the real facts).
But the training for a jetstar first officer costs $180k+ once you factor in the type rating and accommodation costs. Then you start off on $56k as a junior first officer... Before you start having to pay the debt off...
I know if I had a business and invested $150k+, I would hope for a return much better than $56k in my first year even after repaying the loan cost.