… maybe cite them? While I could see a study that says being vastly wealthy doesn't lead to happiness, the kinda wealth gap being discussed here is "cannot easily afford a home" ($70k/y; max $1.7k/mo affordable) and "can trivially afford a home" ($500k/y–$700k/y; max $17.5k/mo affordable). (For reference, homes in my area are currently ~$4.8k/mo.)
And a 2021 follow-up that addresses criticisms of the original (TLDR: if you were already happy, you get more happy > 75K. If you were unhappy, you don't get more happy > 75K.)