At the heart of a casino's marketing machine lies its players club, which uses swipe cards to track gamblers' play as they rack up points to redeem for players club thieves in recent years in scams that have cost casinos. The average person you'll find in a casino is playing honestly. French authorities found the marked cards and noticed the cheaters' contact . eccentrics was initially meant to be an investigation of the so-called Nub Club. Some of these charlatans are targeting you—the slot machine player. The sales copy contained a long list of bullet points, including: “Learn how to use the casino staff as your personal jackpot detectives! (All major credit cards accepted.).