Come on, even 15$! Those are prices you can pay with your freaking lunch money. I Can't believe that in a month you will not gain at least 15$ to pay the game.
And yes, I will not pay an overpriced coke for 3$ when I can buy one at like 1$, but if you're in a restaurant you can't do anything else, so you're stick with the 3$ or you don't take it.