I hear what you are saying, but how many of these people were able to start as a barber, carpenter, or plumber, and build up there business from there? If a barber starts their shop, and off the back of their effort, are able to bring others in to work for them, isn't this effectively the barber earning that?

The barber, using their skills, were able to start a small business that hired others. It's not merely a case of some non-barber just buying a small business that happened to be cutting people's hair. So while they didn't start at 180k, they ended up there because of barbering.