Committing suicide is not the right way and I do not think it occurs in every person it is an exception. Actually it occurs for several reasons. And the money is not equally considered as equal to all the people. Some people think 1000$ is a lot of money while a lot of people consider it as small portion of money so those who have considered it a small portion won't suicide for those types of amount loss in the gamble.
Most of the time, it's the pressure they build up in their minds that makes them take such steps, and the pressure is caused because the money they have lost either wasn't theirs or they couldn't afford to lose it. If you have $10,000 and have saved it for something in your life that you have been planning for years, and you suddenly lose all that money in gambling. Your emotions will drive you crazy after such a thing, and once you lose control of your mind, you won't be able to think critically.
It is also said that a person loses their ability to think or understand anything 15 minutes before they commit suicide, which is why nothing comes in front of them once they have made their mind, and they do it without having any mercy on themselves and on the ones that love them because a sane person would always think about their family before they take such an extreme step.
It doesn't solve any problems, but people who think they can't face the world anymore find this as the only solution to all their problems.