Money not equal to happiness?

Money not equal to happiness? A read in KC Lau blog has put me in deep thought. Research show that people with more money is not necessarily happier than their poorer counterpart. How about financier or money related book which always emphasize on the importance of money and it is always better to have more money than less? Isn't it self contradicting when you say money does not make one person happy but on the other hand say something else. I am in such a dilemma now.
True enough, money alone does not make a person happy. This is because happiness require multi-factor such as family support, friend network, loving spouse, fulfilling carrier etc. Money can certainly get a lot of things done more efficiently but doesn't guarantee happiness in long run. Not having money however can make one suffer too. So in the end, one must have all-money, family, friends, spouse, career and the list go on. So the conclusion is human are always greedy!!!