Why are the 151 original Pokemon cards so expensive?

There is no set of 151 original Pokemon cards. The original Pokemon Base set contained only 102 cards, and it is not the most valuable set of Pokemon cards. The most valuable Pokemon card is the Illustrator Pikachu card, which was a promotional card released in Japan in 1998 and is now worth over $200,000. The value of Pokemon cards is determined by multiple factors, including rarity, condition, and demand.