These guys think their casinos operate like a black hole in nature. They think it is fine for you to make your deposits by leaving your hard-earned money with them when you lose. But they absolutely hate the idea of your making an occasional "withdrawal".
I personally think it is less about the spread, the count, etc, and it is more about winning, regardless of the reason. I wonder if anyone has ever been backed-off or barred when they played _perfectly_ by the count, with no cover bets or plays of any kind, but were losing? And I am not talking about a "return engagement" where one won big the last outing to trigger a video skills check, etc. I'm talking about sitting down at a place you have never played before, and spreading precisely with the count, splitting 10's when the count says to, etc, but still not winning. Something tells me that not winning won't trigger anything but comp offers. But heaven help you if that session turns good and you start winning...