Round one of the play-offs doesn't mean anything. It's no more important than an early round Challenge Cup game.
If you're a 1-4 team and you lose, it doesn't matter at all as you don't go out of the competition and the job of "win three games to lift the trophy" still stands.
If you're a 5-8 team and you lose, it doesn't matter at all as you will think "well we weren't going to win it anyway".
If you're a 1-4 team and you win, you'll more than likely play the team you played in Round 1 again. Hence why Wigan got 7000 on Friday, for example.
People don't have a lot of money.
People have only just come back from their Summer holidays.
And so on...