I have played for 3 months - 5 trips to Vegas and one other location with a spread of 50-400 in DD and 100-400 backcounting 6D. Have won $18K overall and had one backoff and just acted puzzled and left politely. As mentioned earlier, it was a learning experience, I played too long in one spot. But I have clearly been close to a backoff in about 4 other situations - calls to pit with PB turning to stare at me while on the phone, reading my rating sheet, eyes back to me, etc. Or having 3-4 PBs staring at my bets, turning to each other with comments, then all eyes turning back to my next bet. Probably the spreads caught attention from eye above. So I quickly departed in these situations. Question - do you think these casinos where I have probably left just prior to a backoff have an entry in my player club file indicating something like "suspected counter"? With big casino chains, I continue to use the card, since comps are a helpful way to control expenses, but I wonder if I am pushing the envelope and should start to play with no player card in casinos where I have attracted this heat? If such a note has been entered by one casino, I assume it would be noticed by all casinos in that big chain when I first present my card on future visits. I think it is also possible some casinos have tolerated my counting, since, with ratholing, I may appear to be an overall loser. But generally, it seems the spread is much more of an issue to them than whether I am winning or losing. My only backoff came when I was down $1,000.