Can you explain the need for games to be brand new?

Im cool with getting a Nintendo game second hand as long as it works and I can use all of its functions, I get if there’s memory stored then I’d go for the new copies but my boyfriend needs them to be brand new in the packaging and treats second hand things like its appalling maybe there's just something that men like about new games/things but I want to just get a different opinion so I can understand a bit more ehy he's so admitted about it being unused
Can you explain the need for games to be brand new?
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