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Physical version of Mario Kart World will cost €90
(hexbear.net)
And on the American website, the MSRP is $80, with no distinction made between digital and physical yet.
most likely RAM/ROM prices at the time (probably a natural disaster caused a shortage that screwed anyone not using CDs like PS/PS2). Also CDs were significantly cheaper even if there were no supply chain issues. I actually think most games were sold for $50 USD, it's just that the outliers that cost more are a mix of first party games and games where at least the publishers thought they were better than everyone else.