Pokémon fans display cards and products at the dedicated trade area during the 2023 Pokémon World Championships in Yokohama on August 11, 2023.PHILIP FONG/AFP via Getty ImagesIt's official — Pokémon cards are now king of the collectibles industry, according to PSA.The company's president told BI it'd graded at least 6 million Pokémon cards in 2023 alone.The boom came as more '90s kids began making money to spend on their childhood hobbies.The COVID pandemic was an unprecedented boom for the Pokémon card business.Stuck at home, collectors went into a trading overdrive and pushed prices up nearly 500%.