#1 was answered a while back but I don't remember what the answer was...try a search.

#2 I've been stopped once by security and asked to give the cards back. I had picked up some obsolete cards not the current issue at the casino and they let me keep those after a little talking.

#3 I am not discreet at all I usually decide where I am going to exit then start on the opposite side of the casino and "sweep" the place picking up every one I see and head straight out the door.

The one time I was stopped the door I was heading for had a bar by it and when passing someone I new yelled for me to stop and bs...that was all it took it wasn't 3 minutes after that I was surrounded...