Read "Affluenza"...
Book reviews of Affluenza by Wann, de Graaf, Naylor.
It's a great book, and provides a great perspective on the disconnect between wealth and happiness.
Basically... You buy more things that put you in a positive feedback loop to buy more things. You never needed a stereo, until you bought the car. You never needed the CD's, but then you had to get the CD-Burner, etc. Kind of an all too unfamiliar concept.