well because we need it to survive. How else would we get by in the world? Money is important.
Useful read:
What motivates behavior? According to humanist psychologist Abraham Maslow, our actions are motivated in order achieve certain needs. Maslow first introduced his concept of ahierarchy of needs in his 1943 paper "A Theory of Human Motivation" and his subsequent book Motivation and Personality.
http://psychology.about.com/od/theoriesofpersonality/a/hierarchyneeds.htm
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