I think there are two types of people. The first type is people who work for money, another type is people who work for self-realization. I state my position on the following points.
First of all, people who work for self-realization like their job. Money is not important for them, they need satisfaction. I believe that this kind of people makes our evolution and history. They aspire after new inventions and discoveries overcoming all obstacles on their ways. I think that these people are very interesting because they know a lot, read many books and have their own life experience. Of course they need money for some essential needs such as food and cloth, but they do not need them for luxury houses or expensive furnishings. Many scientists are people who devote their lives to new knowledge and discoveries.
Second of all, I believe that people need self-realization. It gives them opportunity to contribute in world's history and share their knowledge and experience with other people. I think it helps them to realize that they are needed by humankind and will not be forgotten. This is priceless.
To sum up, I think that people's aspiration after self-realization is the main reason why we have now good medicine, different means of communications, many devices to make our lives easier, etc.