Tipping is the ploppiest move any gambler can make in a casino. It's the only bet where you're guaranteed to lose. You're fooling yourself if you think it will change the sacred flow of the cards or some superstitious BS like that. The only reason an AP should tip if he thinks he'll get more profitable conditions. That's called bribery and it may or may not be effective, but tipping for no reason other than social custom is a ploppy move.