If I remember correctly, then that is true in Nevada, but not in Atlantic City. There they have to let you play even if they suspect you of counting cards.

Of course that just means they will employ other means to prevent you from counting cards (larger shoes, continuous shuffling, etc).

I've always assumed that the two are really the same thing. If you get good at the game then that implies you're using an intuition for the probabilities of certain events based on the history of the cards.

I suppose the casinos don't have to justify this, or have any moral quandaries about it.