Mark Cuban is famous for straightforward financial advice, such as, "Don't use credit cards. If you use a credit card, you don't want to be rich." It's a message he's shared countless times. But even Cuban couldn't avoid his ironic run-in with a credit card – one that's become the stuff of NBA legend. It happened in 2011, after his Dallas Mavericks clinched their first-ever NBA championship by taking down the Miami Heat. Naturally, Cuban wanted to celebrate in style. He and the team headed to LIV nightclub in Miami, where Cuban decided to treat himself to a 15-liter bottle of Armand de Brignac Champagne (aka "Ace of Spades") with a jaw-dropping price tag of $140,000. When it came time to pay, Cuban confidently handed over his American Express Centurion Card, better known as the "Black Card." And then? Declined. In a 2018 Fox Sports 1's Fair Game interview, Cuban laughed as he retold the story. "I had to go into the back office and call Amex," he said. "They told me, ‘Sir, this hasn'...