Why every one is concentrate to make money and only money?

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Though money plays very important role in our life but every body knows that only money is not a source of happiness. One day I went to a seminar and I asked to all paticipats that the persons having car kindly raise their hands. All the persons raised their hands then I asked for all luxury items, you will wounder every body raised thier hand. It means all persons were having all required luxury item. After few seconds I request to participats that kindly raise their hands who are happy.I really shocked that nobody has raised their hands.Can any body say that why even after having all luxury items, peoples are not happy?