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The casino will know how to deal with the cheat, and maybe they don't have to hire or pay high-security costs, but the casino can use another way. But I am sure the casino can install a hidden camera on their place so the security can watch the activity on every table, and if they find someone trying to cheat, they can directly get that person.
All the casinos are Packed with cameras. The number of cameras per square meter is huge. And no matter how perfect the cameras are, as well as the many places where they are placed, I think there is nothing better than professional people in the hall who are usually looking for cheaters.
I agree with you. there are enough CCTV in a casino and I don't think that professional gamblers will try to cheat in game, because they have enough skill and they know that very well, you cannot able to gamble in a casino for a long time by cheating, you have to be caught one day and you have to pay double the price for what you get by cheating.