Dennis, the stickers are used for guests to gauge their play usually on a 3 month basis. New stickers are then issued if that guest has accumulated several thousand points so they can take advantage of the perks that go along with those stickers such as free admission,free parking and valet, and free beverages. The colors of the stickers then change every 3 or so months so the casino service reps can tell if these guests qualify for the perks. Ken from Naperville, Illinois