If some of these guys made bad moves that cost them financially, it would seem like seeking out a therapist would be the first step to repairing their mental state enough to pick up the pieces and continue on.
In most of the cases, these guys play with other people's money. For example, an investment banker receives $100 million from an oligarch, and he invests them in some HYIP. If some $50 million profit is achieved within an year, the banker will deduct $10 million as commission, and will give the remaining $40 million to the oligarch. However, sometimes these trades go wrong and the oligarchs will lose all the capital. In such cases, we will see guys jumping out of the windows, either forced to do it or not.