Exactly. If the game was sold out, why were there swaths of empty seats scattered around the stadium, predominantly in the FS, like there always is? If these are ST holders picking and choosing games to go to, which is a common trend we're seeing more of, that's exactly a question of commitment.
Obviously some of these seats were likely given out for free to schools etc, but they are not the only culprits here. There's simply too many areas going unfilled for that to be the case.
With this game selling out weeks in advance, these empty seats could have been filled by people that genuinely wanted to be there, but they were left empty, because people couldn't be bothered to turn up for what was a huge game.