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Lack of pax.
Certainly wouldn't want to be paying for J
Which day of the week are you looking at? Is it a Saturday?
It's not uncommon for an A330 trans-con flight to be serviced by a 737 on the weekend due to lower demand.
Noting that SYD-AKL is soon to be serviced by twice daily A330s (albeit to pick up from EK) it wouldn't surprise me to see more A330s deployed away from the PER routes. I'd have thought there's enough demand for the BNE-MEL and certainly BNE-SYD routes for some A330s. Just a guess on my part though.
Given the quality of VAs trans-continental offering (which is superior in my opinion) I wouldn't mind more QF A330s on other routes. I'll continue flying VA to/from PER.
VA have plenty of 737 services trans-con, and probably more when they deploy the A330 to Hong Kong. You'll be needing to pay attention when booking either airline....