It's absolute horse shit
Even in bigger leagues the concept of your key fan being the season-ticket holder who attends every home game is an outdated one. Season-ticket holders are obviously important, and teams do need them (and do need to work on building their season-ticket holder bases). However, there are other fans who follow the team closely and maybe go to a big game or two a year, while there are yet others who may watch the whole season from their couch, but buy team merchandise, drive up the TV ratings and promote the sport. These fans are awfully important to your teams success too.
As the ratings show, there are far more fans of the NRL than merely the ones show up in person for any given game. Some of that's thanks to time and money (attending a game can get very expensive on both fronts, especially when you throw in travel, food, parking, et cetera, while some of it's because the experience of watching on TV can be just as fun (including commentary, replays, etc). Yes, there are some season-ticket holders who have the time and money to go to every single home game in person, but the NRL would be in rough shape if those were its only fans. So it's complete horse shit to discount fans that don't attend games!