Yes and no,your point is valid BUT what about those rich kids that look around and understand from where all of this come.And want to get thier own money/respect ,they got motivation and means to do it.
there are lots of rich kids accomplishing great things on their own, but there is a big difference between being successful and being a superstar in sports or say the arts. while there are a few pro athletes who are sons of pro athletes, it is very rare. I think there is an economic reason for that. to be the best in your field takes thousands and thousands of hours of practice. if you're a child who is too poor, you don't have thousands of hours to practice because you have to help the family get by. If you're well off, your parents are going to want you to be well rounded and do things other than just practice your sport.
Look at professional baseball over the last 100 years. Today, most of the players seem to be hispanic. More specifically, the largest group seems to be Caribbean. A while back, it was Central American. before that, blacks seem to dominate baseball. But did you know there was a time where the Irish dominated pro ball in the US? At another time it was Jews. Another time it was the Italians. This correlates well with the immigration and economic status of these groups. Newly arrived immigrants were too poor to have their kids do something frivolous as practice throwing a ball. But a generation or two later, they were economically secure enough for their kids to become good enough in sports to play professionally. But as these groups moved into the middle class, they discouraged their kids from spending too much time playing ball, and encouraged their kids to study to go to college, etc.
to become the best in anything requires an enormous amount of time. because they have other priorities, sometimes priorities set by their parents, rich kids generally don't have the time to become the best in a sport.