peterc005. Jetstar doesn't have cadetships because there is a social case towards it...the thought process wasn't "we should develop an employment stream of cadets because having to build diversity & experience over a range of aircraft types, airspace, operators & passengers, is much too hard.".
It's not out of the goodness of Jetstar's heart. A quick look at Jetstar's social investment extends to Starkids (overseas child poverty) and Flying Start (community sponsorship). Not those poor poor wannabe pilots...
They found that there is a financial case towards having a cadetship!