This should have been included on the disc, seriously. $4 for 1 hour of gameplay?
That's the video game industry we've created, they're going to stiff us on stuff that should already be in game so they can make profit.
I'll tell you why they do it to, and most of us go there at LEAST once a month, game resellers.
Places like GameStop for example, if they included this with the game and you waited a few months, you get this once $60 game for around $30. But, if they have DLC, they always have that at the same price, so your $30 game is now, $35, $40, whatever the DLC may cost. It's constant income for them, insuring that they always see a profit when a game is resold. They can make a lot of money off the same disc! I play it, trade it, someone buys it, pays for dlc, beats it, trades it, and so on.