People Why People Knows The Right Way In Investment & He Willing To Teach Others While He Can Make A Lot Of Money?

Why people knows the right way in investment & he willing to teach others while he can make a lot of money? - people

Why some people are smart to know that the road investments could and want to make a lot of money, but still teach something to others, how to invest?

For example, how some people in the market. They are willing to tell people what would be the tendency of a population or a book, so others can see how you write to make money.

I do not understand. Serect if held, could so much money for themselves. Why are you telling others how to do?