Already gambling is more of losses than winning, so is quite a normal thing. That is why is always necessary for us to understand that gambling is not a get rich quick scheme, because it is only when you gamble with a huge amount that you can not enjoy gambling. However, apart from that gambling is still enjoyable because is pretty obvious that losing is part of the game, so whether a gambler likes it or not there would definitely going to be losses in gambling.
Don't don't have a prepared mind that gambling is more of losing than winning, maybe they ha e the wrong orientation/information about gambling, thinking they can use it as a source of income to earn a living, so the moment they discover that they are not winning, then it becomes a serious concern to them as to how to meet up with their demands for income in gambling, inability of achieving this makes them feels bad and take gambling as something they have to worry about if it does not come as a winning type for them when they play games.