For example, a poor inner-city parent committing suicide would leave behind children in danger of falling into poverty. But a wealthy parent would know their children could be "all right" living off of the insurance and inherited wealth from the parent.
- poorer people have more friends whom, by poverty, aren't as able to move as much as first-world people, more physical labor (exercise), more children depending on them and fewer choices / expectations / freedoms... the net effects of these factors lead to less idleness, less depression and more happiness
- rich, first-world people have shallower friends whom move a lot, less physical work (more sedentary, less exercise), fewer children and infinite choices... more idleness, more depression and less satisfaction.
Also, if your entire Maslow hierarchy of needs is met, what do you do? What's your purpose? What meaningful problem can you solve or world condition can you change? These sort of existential crises, I think, lead to most suicides because people feel they have no purpose, no function, no power, no influence and therefore don't matter.