DJ had to buy Jetcare or set up their own maintenance operation. As their operation expanded, they became more vulnerable to exorbitant pricing of maintenance activities from Jetcare. They lost out to QF in their bid to acquire the ex-Ansett hangar in BNE which then made it more difficult to set up a maintenance operation independent of Jetcare.
By owning their own maintenance operation, they have moved from the "start-up" phase into the "fully fledged airline" phase