If that were so, they'd spend less, yet they are buying $20,000 bed sheets and, even worse, going bankrupt. Just heard that Kanye West is $53 million in debt.

I think greed is more complex than that. It may include financial insecurity for some, but those who are born really rich really have no personal concept of that. Well, I should say, it's the extraordinary person who is born rich who really gets what being poor is like. (From stories told at his funeral, Ted Kennedy corrected his kids for messing up a bed in a hotel room on check out day after the chamber maid had made up the room, telling them making beds was back breaking work.--He did have personal knowledge of bad backs.)

I think they like pampering themselves and indulging every whim, throwing money around, buying politicians, being named in Forbes as among the richest in the world, having people treat them as precious because they are the biggest donor to that charity, etc.