Maybe there should be several levels of university fees, that are means and assets tested, rather than just solely based on the type of school you have attended?
Because if, for example, I go to Balwyn High by way of my parents owning a house in the feeder zone, and I get CSP placement regardless of financial circumstances - but suppose I'm a student at an exclusive private school, on a scholarship from a low income area, I have to pay full fees. Makes no sense.
There would also be parents who do not believe in private education and hence send their child to a state school but have the means necessary to send them to an exclusive private school.
Although this wouldn't solve the 'state vs private' problem, it would make it a bit more equitable, especially toward the point argonaut raised.