IMO, you're wrong. It's not JUST North America, not JUST Japan, JUST South America, or JUST Europe. It's all of them. Without North America, they probably wouldn't be successful at all. They are from here. They got started here. Their music made it to Europe, and it did well there too. Same with Japan, South America. All parts of the world were/are essential to their success. So to single out one region isn't fair.

I'm with Deb in saying that the "US vs. the World" debates are annoying. The fans from America may very well enjoy the concert as much as Europeans, South Americans, etc. They just don't show it as much. You don't need to jump like a maniac and scream to be a true rock fan.