Bidding on sports items is a past-time nearly as old as baseball itself. And they can bring in big money. At one point, the most expensive baseball card in the world was the T206
Honus Wagner card that sold for $6.6MM in 2021. A Topps https://www.baseball-reference.com/players/m/mantlmi01.shtml card broke the record when it fetched a price of $12.6MM