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We all know why Halo 3 is still on the top 20 charts: Most customers that buy a 360 buy it for that game, it's the reason to own a 360. We often talk about MGS4 being the reason to own a PS3 or Killzone 2 or Uncharted but how come none of these games show up in the top 20 week after week? What game do people buy with their PS3?