I fuzz-out the players' number if I scan a card for a web post. Just rather not have the number and name floating around accessible to thousands of people. Other than that, it's not really a concern.

If any Club member would like one of my cards to put in the machine he's playing, I'll send you one. You just won't be able to claim any of the credits . Note that most casinos require a password to claim freeplay from the card as well.