I see it wrong if you can't handle your emotions thats it
Not only the emotion but also the money that you are pulling in your pocket when you gamble. Things are becoming wrong when it's too much and as for gambling, when you are gambling too much and you can't control not only the emotion, the priorities, the money and other important things that you need to remember then you are affected in a wrong way.
So you say that gambling with money is bad, but what about that kind of gambling where you take points or chose between two sides of a coin? It is actually gambling, but this kind of gambling we can't call bad, cause of it is gambling for the interest without gaining any profit.