Satisfaction with life does not depend on how many things you can afford to buy. Look at the millionaires who have everything. They do not feel satisfaction and therefore go into politics or are engaged in extreme sports.
One way to be contented in life is we should learn how to appreciate on things in our life. Because if we don't know how to appreciate things, we would never be contented in life. And aslo it's hard for us to be contented because the world changes almost everday and every hour, there is new discoveries and technologies released.