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"Free play has become one of the primary ways casinos reward loyal customers who use players club cards. As with complimentary meals, rooms, shows and other perks, the amount of free play you get depends on how much you play while using your card."
<https://tunicatravel.com/blog/2013/06/can-casinos-lower-paybacks-on-slot-machines-when-you-use-a-players-club-card/?archiveYear=2016&archiveMonth=5>