I do not know, in my case, I have never had any problems with winning. On the contrary, after I win, I try to stop to keep that feeling of euphoria for as long as possible. At least for that day when I managed to win well. So, I definitely do not see anything bad in winning and I aim for it. Actually, the same happens with losing. One or two losses, and I stop. I do not like playing on emotions.
You did not have a problem with winning, because you havent won a jackpot yet. An amount of money that changes ones persons life, the amount that was received easily, always twist mind. Imo that is why winning are more dangerous. If you win, you want to win more, again. But if a person loses, then most likely after recovering amount he has lost, that person learns lesson and stops gambling. If a person is losing, his gameplay is limited with his funds, he does not have plans for future. If a person wins, he start to make plans how he would spend money, and while thinking, people realize that its always not enough money to satisfy all their wishes.