OK, these aren't 1-off shows, given that there are a few - but the majority of people who'll attend will be big fans, so many will happily pay the price. When you have a full tour to book you have to keep in mind that out of a stadium of 50,000 people there's perhaps 10% who are big fans, and they'll probably buy the more expensive tickets for the pit anyway, the rest of that audience are probably more casual fans and as such won't pay all that much to see that show.