But despite knowing that it depends on luck, gamblers continue to try. Naturally, if luck is not favor, their lose will increase over time which may exceed their winning money.
Despite of anything, the engagement with gambling will keep them coming back. They will keep on trying, hoping that one day luck will be there and will back them up to make a huge winning. We don't know how much exactly the amount of money those people lose first before they got lucky and made a jackpot.
It's not mentioned, but like what you said, each time you came back and try your luck, you lose more and you will keep coming back and try from time to time. We never know when luck will be there. The only thing you know is you are risking your money in the hope that you may win the jackpot and bring more money to your pocket.