* Rarity: A unique or extremely limited edition card will be more valuable.
* Condition: Mint condition cards are worth much more than damaged ones.
* Demand: The popularity of a particular character or card series can drive up prices.
* Auction Results: Recent auction sales can provide a strong indication of current market value.
However, some of the most expensive comic cards ever sold include:
* 1938 Superman #1 CGC 9.0: This comic book, not a card, sold for a record-breaking $3.25 million in 2021.
* 1952 Topps Mickey Mantle Rookie Card: A PSA 10 (mint condition) of this card sold for $12.6 million in 2022.
* 1952 Topps Jackie Robinson Rookie Card: Another extremely valuable card, a PSA 10 sold for $7.25 million in 2021.
Note: These examples are not specifically comic cards but rather valuable comic books and baseball cards. There are likely expensive comic cards, but finding a definitive "most expensive" is difficult due to the fluctuating market.