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Because if they don't offer a used virtual marketplace, everyone has to buy new games directly from them.

A used game market provides downwards pressure on new games.

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Why would someone ever buy new, if that was the case?
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I'm sure they can think of some things to make new copies a differentiator such as DLC's and perks in game.

Also, 'new games' eventually get discounted as the title gets old. It's one way of keeping money in the game store ecosystem constantly changing hands.

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Maybe introduce virtual scratches? Or like maybe blur the textures a bit every time it's played?
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