I’ve been ejected from several casinos, and it has never been for “counting cards”. Typically, when you count unsuccessfully (meaning you were detected. Anyone can count with practice, doing so while remaining undetected is the difficult part) usually a pit boss or even a floor manager will approach you. If you are actively involved in a hand, they will wait till you finish your hand. At that point they will get your attention either directly, or directing the dealer to not deal to you anymore.
There are several creative ways which casinos will inform you that your business is no longer welcome, but I have never had a casino employee give me the reason as “counting cards”.
When I ask why I’m being asked to stop playing, I’ve had them tell me,
“Here at the xxx casino, we don’t appreciate your style of play.”
“You’re too good for us.”
“I think you know why.”
And always after I’ve been told to stop playing, I have always been told that I’m welcome to play any other game in the house, just not blackjack. So really, you don’t get kicked out per se. However, if you attempt to play again either a short time afterwards, the next day, or some future time and they realize that the casino has already asked you not to play, you will most likley be informed of the state laws regarding tresspassing and told that the next time you enter the property you will be arrested for trespassing. Not counting cards.
From what I’ve been told, it would be difficult to arrest you for trespassing prior to informing you of the laws against trespass. Therefore, it is of little risk to continue to attempt to thwart the casino, until such warning is given. Of course, this is assuming the casino doesn’t take you to the back and put your head in a vice, like in the movie Casino.
Automatic shuffling machines exist at several casinos I’ve been to, but you generally wouldn’t have multiple decks going at the same time. I have seen places that utilize a continuous shuffle, which periodically reintroduces burnt cards back into circulation. There is not beating this, and card counters would not play at these places (maybe a single deck, but not a multi deck game).
Keeping a count while dealing would be quite difficult. Keeping a count while conversing casually takes a bit of effort. Keeping the count while interacting with customers, and trying to calculate 3/2 odds on a $46.50 bet and then watching as 6 other people at the table who are inebrieated demand a “hit card” after they’ve already busted to see if they can get the dealer to make a mistake makes it even more difficult. Combine that with the fact that most dealers get training of about 8 days (the training I and my coworkers got) and are sent to the floor, leads me to believe that most of the dealers that know how to count, can do so while activley dealing, and choose to do so, would have done so outside the scope of their normal employment.
I tried it when I was a dealer a while back. I could do it, barley, probably not that well. The payoff for doing it, none. I stopped and just had fun dealing blackjack shortly thereafter.