In 30+ years of playing and counting, I have run across no more than a dozen confirmed card counters. A few more may have been slick enough to be undetectable, but I doubt it.
I've tutored players in person, over the phone and via e-mail who have read Bluebook II, and most remain hung up on the Sacred Flow, the Dummy at 3rd Base, Pressing Up on your Wins, Walking away after losing 4 in a row, Quitting when your Ahead, altering Basic Strategy based on the last two cards out of the shoe, etc, -- and they continue to contour the crux of their game along those lines. They augment counting into their game by turning a structured count system into "having a feel for the count", won't practice, don't ever want to lose, and if they do, they say it's not worth it or it doesn't work, and usually go back to their betting progression.
For an example of what I suspect might be an example of this, see the latest written review of Bluebook II on Amazon.com. With all that said, I'd guess maybe one blackjack player in a couple thousand is a competent counter.