lol, this thread is ancient, but so am i now
i mainly play games to pass the time or screw with people, very rarely do i ever play to win anymore. even when i play hard games, like BoI, I don't always play to win either, BoI really shines in breaking the game, not winning. i have too much stress in my life to really bother playing games competitively anymore.
imo, almost every medium is a way to tell a story, now before a random hardcore gamer is going to crucify me, i define "story" very very loosely. it would make more sense to say that every game exists to give players an experience (or multiple experiences, similar or different, depends on the gamer and the game). winning can also be an experience.