"IF I HAVE SEVERAL CARDS FROM A CASINO I STOP PICKING UP THE COMMON CARDS AND JUST LOOK FOR VIP CARDS"

I use to do the same thing. But a few times I picked up cards from casinos where I already had more cards than I need and found an older variation or a newer card not seen before because the reverse had something different. So you see those common cards may not be so common. Now I pick them all up. Barry