I was playing at the bar and handed the attendant my second card. He went down a few machines, wrote down my number and then came back and pulled my other card out of the machine, checked it, reinserted it into the machine, and gave me back my second card. Just seemed weird. I can't think of a reason why he did this. I used to play on my husband's card when I'd let my tier level decrease. This time I had a good multiplier for bonus points so played on my own card. Has anyone ever been questioned about using a player's card other than their own in the machine?