>>19093868The difference is that Stardom and other puroresu companies hold multiple shows a week in various towns. They save Ryogoku and bigger venues for bigger shows, which are going to have higher numbers than average. But people can see those promotions practically whenever they want.
WWE rarely shows up in Japan. If they had a huge fanbase in the country, people would have travelled from all over and there wouldn't have been an empty seat in the house.
No one is saying WWE isn't the biggest company in the world that wouldn't outdraw these companies anywhere else. But it's not a draw in Japan.