When you see photos of groups of different peoples, it seems that the poorer ones (if they have enough to eat) are the happiest.
Pursuit of material wealth evidently doesn't make you happy, even if you succeed.
These notions (that money can't buy happiness, or that the poor are happier than the rich) have been debunked by scientific study, which has shown that up to a certain point ($70k per year income in the last study I read about this) money does
buy happiness, but after a certain point there are diminishing returns.
This is an intuitive conclusion, after all money clearly can buy the base necessities (such as food and water) but is less easily able to purchase higher-order human needs (such as self-actualization, see Maslow's hierarchy of needs
But the bottom line is that the poor often face deficiencies in the basic human needs that the rich do not, and this results in the poor suffering more than the rich. It's a nice sentiment to think that the poor in money might be richer in spirit but in practice the poor suffer much more surviving on this rock and that is reflected in their average levels of happiness.
That fewer aspire to be poor than rich in their pursuit of happiness is telling.