Billionaire investor Ken Griffin has been known for making some rather eccentric purchases.Back in 2021, Griffin paid a cool $43 million for a first-edition copy of the U.S. Constitution -- outbidding a decentralized autonomous organization (DAO) of crypto enthusiasts in the process. More recently, Griffin shelled out $45 million for a stegosaurus fossil. I can say in full confidence that Griffin's man cave is much cooler than anything my friends have in their houses.Griffin has amassed his fortune as a hed ...