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Well, it's a drug, so

These sets have tons of cards with unique names, meaning the sets have a much lower number of reprints, even if they have similar abilities and effects

Being cards featuring Pikachu already makes these cards desirable for us all, but making them sparsely obtainable made it so anyone outside of China will have to pay a pretty penny to own any of them

Note that its what WotC usually does in traditional Draft environments, seeding sets with certain uncommons or rares that might inspire niche Limited decks (two great examples include Slime Against Humanity in Murders at Karlov Manor and Dance of the Manse from Throne of Eldraine )