This is simply what we are being told in daily basis that loses are inevitable and winning sure is hard to come by and when you keep it going you end up being addicted. The fact that the negative side of everything is destructive mostly and the positive end as well can be destructive too basically when you're applying greed and at that point it's so difficult to stop playing .
A win always gives another hope, I see nothing wrong with winning. Sometimes a win after a losing streak of several matches can lift our spirits. But I also see nothing wrong with a winning streak, because usually they do not last that long. You can decide to continue playing after winning, or take the profit, it all depends on your mood and your strategy. I know that losses can put players in big debt, but I have never heard anything like that about winnings, so winnings are definitely good.