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Piracy, of course.
With Piracy there is probably absolutely no chance in that person ever buying a game off the shelf. They might never do it, even. With used games if the person likes the certain game they are more likely to buy the second one or another game made by that developer. Even if they got the first game used they might want to pre-order the second or buy it in it's first week of coming out. Plus they might also buy DLC for the game which goes to the developer.