I agree that not all people can be motivated by money. Some are motivated by their wills and wants to make things they really wanted or in order to make change. Some are motivated by the attention and praises they get from other people.
There are different ways to motivate people, not just money.
Well I think only some people are not, but most of us are really motivated by money and this is the reason why we strive hard and make our best efforts to earn good profit.