It may surprise you hear this, but there are a lot of people who don't go to movies or go out drinking because they can't afford it.
There are also people who can afford it, but not all at once.
There are also adults who may be able to afford it, but keep their kids out because it's perceived as too expensive.
It's not about whether people can afford it, anyway. It's about whether people will pay it. If people decide to pull themselves out (or worse - their kids) based on this, the ARU will not suffer. They will turn a profit from this. The clubs, however, will bear the brunt of the decreased subscriptions.
Economics is not all about affordability.