You know, it is quite surprising how many people are completely addicted to gambling without even noticing it.
It's not just about the high roller, most often the noob one who think they're just having fun.
I've read
research that around 10M to 20M Americans have been surveyed to have gambling addiction or at risk of falling into it.

Most often it is noobs who hits a big jackpot early on. Yeah, that elementary gain can be thrilling, but they feel overconfident and consider wagering as easy money and chasing that high to catch another bigger jackpot. On the flip side, you will find many people who can't accept a loss. he has always tension to recover what he lost.
Lack of self control leads them to be addicted. Only resisting the urge to gamble will not help you, you must be in control of when to step back.