It's not a new tax. It's an increase in costs.
The levy appears to have been a temporary measure, which despite the implication that they are all fat cats sitting in their ivory towers counting their money, they didn't want to have to charge, hence it being a levy, not an increase in fees.
Unfortunately that has lead to an increase in fees. Not good, but at the same time, have fees moved at all in line with inflation?
Personally playing on the Gold Coast I'm pretty sure my subs were $270 in 2006, and the last year I played there they were $270 again. Pretty sure in 3 seasons at Melbourne Uni they did not change at all either.
How does this compare to other sports? Likely negatively. It wouldn't surprise me if AFL junior fees have decreased in real terms. But their revenue has also increased in real terms.
It's almost at a point for the ARU where it's the economies of scale which is making them not feasible. With certain fixed costs that cannot really change regardless of size of market, they would probably be outlaying similar now with 6 professional teams, and the participation they have as if they had 16 or 18 professional teams and similar participation to AFL or Rugby League.