casinos are mostly based on math and human emotion
people want the thrill of winning, that is for sure
and with math and good systems you can limit downside, as you say it's always a good day for the house
Sometimes the system has also been improved with certain algorithms that ordinary gamblers don't know about, because basically casinos want users to always make as many deposits as possible at gambling places, so it's better to be careful and be able to control your emotions well so that you don't spend too much money at the casino.