Are Americans really ever satisfied?

As Americans are we ever truly satisfied? I remember seeing a YouTube video of some gal throwing a hissy fit because her parents bought her the wrong color new car. When I was in high school you were happy to get the use of the family car and to get passed down the car was about the pinnacle; getting bought a new car? That was practically unheard of.

People get lateral promotions where they get more money and responsibility but they are not happy because they did not move up the org chart.

We American want ever larger serving portions at restaurants or we feel we are getting rooked.

It goes on and on. Are American every really satisfied?