A friend of mine work in a cruise-casino.
She explains that the first "trick" if casino is losing money consist to continue to play, delaying closure time (more time you play more probably you will lose).In some games like roulette it could possible also the change of croupier.
of course there are some "distractions" like free drinks offered to various gamblers.
Interesting, this is to delay or stop the momentum if you are served drinks several times, the gamblers tend to lose because of fatigue factors, they cannot keep up on keeping their winnings for long hours, the casinos are good in keeping you play they will treat you like a king and give you everything you want and need.