On a recent trip at NYNY, a friend of mine was playing $25 DD blackjack. Bets were varying from $25-$150 depending on he count. After coloring up and leaving a couple of suits found him minutes later walking around and told him if he wanted to play again here and "varied" his bet, he would be flat betted. I told him it was probably just a "verbal warning" but he thinks that he was entered into their (MGM properties not just NYNY) system as a counter. He now will not play blackjack at any MGM properties. Is he over reacting or do they keep tabs on issues like this? BTW, this was after a couple days of winning maybe $1200-$1800 in about 5 sessions.