I was just thinking about why people have an addiction to wealth (or extreme wealth in some instances), and about how it sometimes must play out in elite circles. It started with the word ousted.
Many of these people work at a company for quite a few years before reaching the top at a specific company, only to receive enormous pressure from below to get out of the way so that someone else can bank. This leads to older, wiser people oftentimes eventually being ousted.
So the older, wiser dude was at the top for a bit, and he liked being super rich as opposed to just rich (just as a rich person likes being rich as opposed to just middle class). Sure, he is still rich and wealthy, but not extremely wealthy. He looks around him and sees his peers, some of which are still super rich. Feelings of envy begin. Older, wiser dude, not taking humanity into account so much, comes up with pretty decent a strategy to attempt to use remaining wealth to forcefully inject himself amongst the super rich (this is where his addiction becomes bad at a global scale). Older, wiser dude might be successful, or he might lose damn near everything (only a few million left ya know).
So, I would think what is really driving this search for more when one has enough is the transiency involved with the vast majority of extremely wealthy people (and the fact they are allowed to gain such power as an individual in the first place...). It is not uncommon for people to be gunning for the top dog in the form of an ouster. So, it is pretty much like any serious addiction. They experienced something so great that after losing it they wanted it again so bad they would do damn near anything.