The type of security research skills they elude to in their advertisements will fetch salaries in a range well above $100k within the commerical sector. The one advantage they do have is that these kind of specialist jobs are generally not easily available in Australia.

I guess they are aiming towards the naive but enthusiastic university students who will stick around a few years before the appeal of working for the dsd wears off. I can't see them holding onto good people for to long without being competitive on the salary front.