It’s one thing to answer a think-tank survey. It’s another thing to see these people react to the events of their lives on this planet. Riches grant no immunity to the unfairness of life. Let a rich person’s child contract some rare, incurable disease and see how fast the money gets burned thru. Riches provide options, not joy.
At the risk of coming across like Chauncey Gardiner, freedom from want and economic worry, or even a cushion protecting you from it to an extent, creates room for happiness to grow and to spread, provided it’s already taken root. It’s not going to create it where none exists, though.