Sometimes, it's not really the depression and addiction to gambling that pushes them to want to commit suicide, it's pressure, pressure from people they are oweing money and all that.
This part, I forgot to mention this as some special case. Pressure is indeed one of the main culprit why some people choose to end their life because they can’t handle the criticism by others.
I read some cases that involves student that use his tuition fee or borrow money to a friend and lose it all.
The reason for this depression most times, when one takes a very expensive risk and the outcomes of the game is what was never expected , the only thing one can think of is to just hide from the world expecially if the money that was being used was a borrowed money or money that is meant for something very important and when people lose it, it seems all hope is lose. They feel the pain and criticism so big for them to bear.