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Quick JumpTretton: no backwards compatibility boosts PS3 game salesSony once explained the reason that the lack of backwards compatibility for the 40GB version of the PlayStation 3 was because of cost reduction. While this is true, apparently it wasn't the only reason.
According to GameSpot, Sony Computer Entertainment America CEO Jack Tretton explained to the Wall Street Journal that the decrease in manufacturing costs isn't that dramatic. However, Sony hopes that taking out the option to play PlayStation 2 games on the console will lead to more sales of PlayStation 3 games.
Tretton further added that research suggested that the feature won't be missed because consumers who buy the console probably already own a PlayStation 2.