[alfus21]

They feel irrelevant in their mundane everyday lives. Then something happens (such as losing their job) and it makes them feel worthless and that nobody recognizes him/her for anything.

The way I see it, they know if they just kill themselves it won't make them any more known than they already are so why not have people talking about your name for years to come and go out as somewhat of what they may see as a "legend" to others who feel the same way.

Sick, but it's my view on how they see things. Or at least some of them. Truth is we'll never know what is wrong with people like this.