#3 Global appeal
The UFC's home base is the United States of America. The WWE's home base is the United States of America. Despite both promotions having a large presence in other countries, it is the USA where the majority of their revenues come into play.
This is what makes someone like Conor McGregor so valuable to the UFC: He is able to draw in crowds from all around the world, and especially Ireland. His popularity is so extreme, in fact, that a large number of Irish fans make the trip across to the States in order to see him fight. This sort of drawing power makes McGregor worth his weight in gold.
Get the latest updates on One Championship Rankings at Sportskeeda and more
Shinsuke Nakamura presents the same kind of appeal, except his fans, come in all the way from The Far East. Japanese people consider him a sort of hero and the fact that he has been so successful in the west only makes them love him more.
Combine the two and you have global fans at your doors.