Careless harvesting is a definite negative to slot card collecting and to the individual. If security/casino personnel begin to associate harvesting and collecting, we can all expect heat and bad treatment. Eventually, we might have to say goodbye to blanks at the booth, etc as we will be viewed as pests or undesirables. We could all be tarred with the scumbag brush. I don't see why anybody has to take every damn card in the freaking club anyway! How many Harrah's and Stations cards does one person need for crying out loud? Really common cards become impossible to get rid of, so why take these unnecessary risks for no gain? When I harvest, which is now fairly rarely, I only take obsolete or "good" cards. If it's common crap...I walk by. I suggest you do the same!