Everyone wants to be happy, but nobody wants to be happy with what they have.
No, most people think getting more (or getting something else) will make them happy.
> Why would you not want that. Like, ideally we'd all be happy with nothing, right?
Because it's hard to become wise, and that's not what society teaches.
Competing for mates is one of the basic mechanisms in evolution, seen in many animals. Instead of fighting the tribal leader or whomever to display fitness, humans came up with a less violent solution, which manifests itself in the ability to buy things.