Great idea, but very difficult to do.
Take the Bulldogs, Knights and Sharks for example.
The Bulldogs play at ANZ Stadium. 80,000 tickets available, ranging from "sideline" to "nosebleed". They have all areas seated.
The Knights have 30,000 tickets available. Nice grandstands on either side, hill areas on the ends. They have most areas seated.
The Sharks have 20,000 tickets available. One and a half undercover grandstands. One uncovered grandstand. Concourse seating around most of the field. Lots of unseated areas.
How would you justify charging the same for a spot on the hill (Bronze / Category C) at Cronulla as you do for a seat undercover at the Bulldogs home game at ANZ? Or Suncorp? Or AMII Park? Or Skilled Park? The there's Brookvale which is another whole kettle of fish!