The feeling to win your money back. It should be banned because the casino always has the upper-hand. If they were really that generous, they would loosen up slot machines. And I feel a bit suspicious with the need to push for membership cards. I have a feeling that these cards track your win/loss record. If you are up then they will bring you down and vice verse. Just to keep you interested.
In different countries the management of casinos pay a group of random kids struggling for money to play the tables at a certain time. They get paid about $2,000 each while the big payout goes either back into the casino or into managements pockets. I'm pretty sure this happens in the U.S. since it was started by the Italian Mafia.
I also think it's unfair that card counting will get you thrown out. So to the people sitting there saying that gambling is good stimulation for the brain, I guess you should stimulate to much by being able to count cards.