It's not the most important reason by a long shot, but it's yet another reason why extreme wealth hoarding, aka billionaires and centimillionaires, should have been taxed out of existence and legislated from existing going forward:
Even they aren't happy, even sitting in the complete victory of their coup. They could have a dozen space station mansions each and they still wouldn't be satiated or satisfied. They can't be satisfied. That is their defining character deficit. Literally everybody loses so long as the avarice diseased capitalists remain in charge, even them. The intensity of their cringeworthy attempts at social media flexes betrays their intent and blasts us all with their screaming insecurities day in and day out.
They're mentally ill with an obsession/compulsion related disorder that they've manipulated civilization into enabling at literally every possible expense, including mass human murder and seriously risking human extinction for short term private profit.
They should be in mental health facilities receiving inpatient treatment for their extremely destructive antisocial behaviors for both their and everyone else's safety and wellbeing, too bad at least in the US they defunded mental healthcare into utter ruin (and education, and common infrastructure, etc) to cut their own taxes through their captured government.
The inmates are truly running the asylum our society.