The more some folks have the less it is enough. Why is that?

When all you have is a pair of sneakers, it is sensible to wish for a bike, but ridiculous to wish for a private helicopter.

And that does not change, The richer people get the more they can reasonable wish for. After getting rich enough they might even wish for 'their own' nation. And that can be a problem because people (even poor people) are not property.

probably cause that makes them want more