Some people want to buy soundtracks, they want to buy music. They DON'T want to buy a game, especially not a mediocre one with bad reviews. Demanding the purchase of games before downloading music WILL NOT lead to sales. Quite the contrary, it means people won't buy anything at all. Zero sales equals $0. Sell soundtracks without requiring purchase of games.
I saw someone else play it on their computer. No thanks.
