Winning a jackpot must be great, but it doesn't compare to the amount the casino takes in. It's only a small portion. For us, it's a big prize, for them, it's tip money. It's rare, but it's possible that someone hasn't bet/lost enough money to win a big prize. Once again, it's down to luck. We may not beat the casino, but we can certainly win. It's difficult, but not impossible!
When someone can say they have won the casino is when they win a large sum of money while they haven't staked upto that amount. It's only a jackpot or a large amount that can justify you winning the casino. Any other wins apart from this doesn't look like a win by you from the casino. The casino are making the most profits hence your small wins can't affect them but when you win a jackpot that the casino will have to send you a big amount, that's when the casino is going to feel your victory. We have big casino that it doesn't matter how much you win, they can always afford to pay you because of the amount of revenue they're getting. Some casino are so big that only a small percentage of the money they realized are being used for the daily payout.