RGJ.com – Time was, gamblers didn’t even want credit card companies maintaining a record of their time in Las Vegas. Now, visitors want loyalty points from mainstream hotel chains for the days they spend holed up in Strip casinos. Casino corporations MGM Resorts International and Caesars Entertainment Corp. have both announced loyalty program partnerships with major hotel chains (Hyatt and Starwood, respectively). The independent Strip casino the Cosmopolitan is also partnering with a hotel chain, striking a deal with Marriott. The deals enable customers to earn and redeem loyalty points with both the hotel and casino chains, and also hold…