Probably because it largely acts as a proxy for survival mechanisms.

Give most people want they need and a little of what they want and you'll find most greed driven behaviors largely disappear except for a select few who I'd argue have dysfunctions or lack basic social maturity.

The Mouse Utopia study from the 1960's suggest otherwise.

https://www.smithsonianmag.com/smart-news/how-mouse-utopias-...