Why do we still feel poor?

I found this interesting article that talks about how much more money a random couple make than what their parents did 40 years ago, and how many more luxurious items in the household are now available for any average "American" couple (I believe it also works in Lebanon), such as a flat screen TVs, iPods, top of the line cars, ACs, etc.. And even with all this we still feel poor. Why? Because the rich people have gone even richer. I know I am jealous of them.

We're richer and more comfortable than ever -- but we're still dissatisfied. Polls say average Americans think their parents had it better.

Article's source: The average American at 300 million By Forbes.com