People often look at this problem from the extremes: everything and nothing.
The 1% of the world seem to be obsessed with acquisition for its own sake. Warren Buffet, often considered a fairly decent if extravagantly wealthy fellow, never tires of "compounding." Just as obviously, Buffet is not a normal dude and is almost certainly on the autism spectrum. He likes compounding because he can't let it go - because he has a mental disorder. So now, what is everyone else's excuse? As Olive Stone stated it in the movie Wall Street: "How many yachts can you water-ski behind? How much is enough?"
Then there are those children and villagers we see on late night television. 50 cents a day will change their lives, we are told. We see images of people barely clothed, flies swarm, shelters look like lean-tos. Obviously those folks could use a bit more. Suffering cannot be pleasant. But much of what holds people in poverty is political.
The reality is that like most things what you want is somewhere in between. It is absolutely possible to have enough and simply be happy with that.
The difficulty is this: most people don't realize when they have it good already. You've got to know when you've reached the "enough" phase of life.