This.
Most people simply don't have enough time for everything. You have to use your time wisely and to be very good at something to be successful. Unfortunately, most people have neither enough time nor enough talent. If you have both, you have an opportunity that most people on this planet never had and would never have - use it!
It's not wrong when you say it like that, but usually when someone who already has a certain skill and he can develop it into a business slowly, of course that person will not think about working for someone else but will work with himself and try to build his business to be wider. Because after all working for someone else will have very little freedom that we can get so that sometimes it can be very disturbing for some people who already have certain abilities and also the time to make something important in their own lives.