Why do Koreans come to NA after worlds?

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I'll give you the answer FOR MONEY.

ranked season resets after worlds a high rank makes your junk look big people will pay money in korea as a regular practice to get an edge over the competition so a market for this exists people in America will pay to get their rank raised so the ladies will be like "wow" as they look into the camera like in the movies because everyone loves a winner and the Korean market for rank raising has no real competition in the states where such a market does not really thrive because it takes a lot more than one or two games to get enough clients

I'm fairly certain you already know the an$wer to thi$.