Probably because they are "addicted" to gambling. Yep people can be addicted to even scratch and win games. Why? Mostly because of that "High" feeling they get when they win. They keep playing trying to getthat high again. As they get deeper in debt they just keep believing that if they get that one big win, theyll be able to recover their losses and stop, but unfortunately, that big win never comes, or if it does, they just get that high feeling again and want to keep playing.. . Just like any other addiction it's usually caused by turmoil in their own life, problems in their marriage, at work, or issues from childhood.. . There are associations to help with this, there is actually rehab for gamblers and GA (gambler's anonymous.). . Hope that answers your question.