The reason ultimately comes down to the people’s attitude. They simply have an easier time accepting other performers who’ve also gone to similar performing arts schools as them. Two employees who’ve graduated from the same college would naturally bond closer, simply because they had the same alma mater. Just by calling them , the distance between them would decrease. Not only does the industry highly regard these elite performers, the performers also have access to resources others did not, such as information from said famous art schools.