One way to make more money is to reduce costs (pesky things like humans who expect a reasonable salary) while focussing just on the services that deliver the best return. 'Pareto analysis'/'biggest bang for buck' - all the usual approaches.
Airservices should have an equivalent of Telstra's 'Universal Service Obligation'.
I've said it before: Privatisation of the Commonwealth's airports and turning the ANSP into a quasi-business venture was not in the public interest. It's made plenty of individuals millionaires (and at least on billionaire), by allowing them to milk the public to use the public's own assets.