there is probably an element of...if you can't make it to both games (4pm because of work) that it's a bit of a ripoff to buy a ticket just for one game.
Have heard a few people say "I don't really want to buy a ticket for just one game"
It's rubbish as the second game is essentially free. But it's just a perception people get with the way it is set up. They value the games at $15 each (or whatever) so don't want to pay $30 for one game.