The AFL totally dominate the VIC, WA, SA, and TAS markets, and hold a higher market share in NSW and QLD than the NRL could dream of having in VIC, WA, SA, and TAS. You could quibble about the ACT and NT if you liked, but at the end of the day both are largely irrelevant to the broader picture in the grand scheme of things.
If dominating half the country and having a significantly stronger share in the other half than the competition has in yours, and all the metrics that go along with that, isn't enough to make you 'king', then I don't know what is.