Blackjack for winners:
Now, this Basic Strategy to win in casino is to play consistently from the beginning to the end of a deck, will usually not be enough to allow you to become a winning player. All Basic Strategy is saying is that if you played head-to-head with a dealer, and she shuffled up each time after dealing a hand to you, and you played a thousand or ten thousand hands like that, by following Basic Strategy, you may have (depending on house rules) a slight edge over the dealer.
But, in real life, almost any time that more than four cards are dealt out, a bias of some sort has developed in the deck as the result of the depletion of certain card values. Sometimes that bias will react favorably to Basic Strategy, and about an equal amount of time it won't. A minority of the time, the deck will retain enough balance to have no bias after the first few hands, but, by and large, it will be altered enough to cause the blanket use of Basic Strategy over months and years to be as successful as flipping a coin and always calling heads.
The use of Basic Strategy, in certain situations, is one way that pit bosses detect counters. Generally, though, they don't care about it because most users don't get very sophisticated in their play-they just memorize some charts and respond accordingly. The casinos have devised some very successful defenses against Basic Strategy, so, on the whole, they don't mind seeing it.