Sometimes people do various things even when they are not receiving any money for it. That is natural and I think that you understand it. That is their hobby or they simply feel happy when they are performing this activity. They wouldn^t like to change it and that is why you have to respect that. Naturally it would be better for them if they have earned money for their work as well. That is not the case unfortunately. They have to accept it and keep on living the way they did before. I have a friend that is a perfect example of this kind of person. He is interested in something and despite the fact that he would be able to make a lot of money on it, he doesn^t want to do it. He feels comfortable in what he is doing. He is an expert in terms of iphone app development. He knows everything about it. You can talk about this subject with him for hours and he would still find something interesting to tell you. From what I know he has been reading about iphone app development online and that is why he has such a knowledge about this issue. Do you know any similar people to this friend of mine. What kind of experts are they? Maybe they like iphone app development as well?