Your competition is a very top heavy competition. Your best 8 teams only make the finals , your bottom teams aren't included (Similar to Friday nights actually.)
Because RL only goes 100min and AFL goes 150m you benefit in the ratings by many viewers switching over for the final 50min of your game.
when you have 4 massive games , Some less enthusiastic fans aren't draw to all matches.
RL is also a far more tribal game. Also the NRL don't get ratings from its 15th side.
Viewers go out to pubs/clubs of a night , the Northern states have thousands more.
All buts aside thought we get the most

, the highest

, and have a superior average

Rugby League, the dominant force in Australian sport!
"I do like annoying the Victorians; they are so easy to get, At times I've looked at them and had a giggle." Peter V'Landys