I can go on...

AFL invest in stadiums, with a long term goal of strategic control
NRL pays rent

AFL own a radio station and have non-exclusive radio rights
NRL give exclusive rights to 2GB

AFL give salary cap exemptions to fast track success to frontier clubs (Lions 3 Premierships, Swans 1. 4 this century)
NRL give new teams and frontier teams no help

AFL get the gravy off Fox Sports
NRL made Fox Sports

AFL have a united national brand from auskicks to AFL
NRL have several brands and authorities in charge of grassroots

AFL take games overseas and actually do try to grow the game as ridiculous as it is, AFL clubs toe the line
NRL (rugby league) has a proper international tier but NRL clubs and fans canibalise it

AFL has a compliced Melbourne media who cover stuff up
NRL has a blood thirsty Sydney media who can smell blood

AFL fans cheer for their club
NRL fans support the game