Jeremy is good for unbiased takes on some things, but he often likes to use hyperbole/clickbait-y titles/thumbnails as well from time to time. Did you watch the video? Does he list any charts/facts to back that number up? Thanks for any info.
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Crosmando: Maybe people don't want to play the same game over and over again but with a different skin (ie Asscreed & Farcry).
This depends on the game. I know some(myself included) who love playing more titles in the same series even if they are somewhat similar(genre/look/feel/etc).