The thing about the use of money to buy happiness is that even if you do manage it, the fulfillment quickly extinguishes the desire, much like how eating quickly diminishes the appetite, or how the thrill of a new car all too quickly fades. This explains the trend toward always having the latest and greatest new technology—a constant struggle for fulfillment in the desire to enjoy.
All of this takes money, of course, and how many of us now have enough money even for necessities? We clearly see that today only a small percentage—some thousandth part, the elite—have risen to the top of the social-economic ladder and all the rest remain at the bottom with little hope of change. The elite still manage to make a profit, but increasingly by deception and by keeping it all to themselves—no trickle-down theory here, right? However, this is impossible to sustain forever because the wealth of the elites is not based on anything tangible, just printed pieces of paper.
This has all come about through the developmental engine of egoism. Through growing egoism, humanity has gone through periods of slavery, feudalism, capitalism and socialism, until now, where it is no longer possible to thrive based on egoistic calculations, i.e., to steal a little from here and to snatch a little from there.