Some of us did some VERY minor multi-carding a decade ago. (some probably even before that). I am talking 3-4 accounts, maybe a family member or friend, that generated multiple mailers with free play. And surely the casinos knew and accepted that. How many times do you see some older lady at the Kiosk swiping 3 or 4 cards.

And then the serious multi-carders got involved. Teams of people doing what Dark Oz and seedvalue have talked about. 100's of accounts. AND THAT ruined a good thing for everybody. It forced the casinos to care and crack down. First, I heard was a team busted in Pa about 8-10 years ago. And then I read about a few people getting busted in Colorado, including some folks that were just playing on a couple cards of family and spouses. Like I said, ruined it for everyone.