Only if you look at it from a single, narrow angle.
Defence industry in Australia gives options. Mobilisation, scaling, flexibility, rapid modernisation - all of those are more possible with a factory in Australia. Take a soap box of mine - ammunition. At the moment I need a ship to come from Europe or the States just to bring all ammo bar 5.56, 7.62 and 155mm. So for me to stock enough AGM-114 (as an example), I need either a big warehouse that is full (expensive, runs out of life in 10 years, needs guards / facilities / etc) or constant (and
guaranteed) sea lines of communication.
Or, I can stockpile the fancy electronics (no life, small) and build the EO / body in Australia. Now if I need a dozen / year I can just run a batch every 24 - 36 months. And if I need hundreds because of a conflict, I can surge - all in Australia. No multiply that across all our ammunition fleets. Sure my ammo may cost a little extra per round in peacetime, but when I need it (and in numbers that are mind-boggling to most of Defence, let alone the rest of the country) I have a much better chance of getting it. And, overall, I can do it for cheaper. Now take that across all our fleets. We still need key parts stockpiled, but it's less.
Now take another approach. As
@RDB states, upgrades are easier. ANZACs are known by Australian industry, so the upgrades were easier. The same goes for all of our fleets (note this does not prevent project screw-up's a'la M113AS4). We build stuff in Australia means that we know the fleet, the platforms and the sub-systems. That enables us to spiral upgrade better. It also means we may be able to expand our economy. Australia becomes a hub for the fastest grown militaries in the region. We become the preferred security partner as per the DWP16. Indonesia, Fiji, Malaysia, Singapore, Thailand, PNG - all using materiel made in (and maintained) in Australia.
All of that - it's worth a few extra bucks.