The producer originally developed The New Home Show for one of the major cable networks. It was something that he wanted to share with a great number of people. He felt that if the viewers were empowered with the knowledge of home building as a do-it yourselfer they could derive great benefit from that knowledge. Home building contractors don't usually build houses. Often the people doing the actual building aren't even on the home building contractors payroll.
Most people are.
That's what a contractor does. He contracts and arranges for different companies and individuals to build a house. The contractor is able to do this because he has the knowledge to plan for and arrange the building of a new house. That's not to say that home building is easy. As you probably know by now, nothing worthwhile is ever easy.