Honestly, the only way to win the casino is to hit the jackpot and quit gambling. If not, you will lose it back to gambling. This is why you must be contented with any amount of money that you win. When you're not satisfied with little wins, you'll still not be satisfied with big wins. Greed is very bad and can steal away our glory from us.
In as much as jackpot is the show of winning in casino since only jackpot can give us such fulfilling feelings of winning in the end, but we shouldn't also forget the small wins that keep us going before the jackpot arrives because at some point those small winnings are what fuel the bigger ones that give that satisfaction in the end, so you are very right to avoid greed and he satisfied with even the smallest winning is what make the most sense.