So EXO would have never been a million-seller, damn then why they let those nugus get so big...
I don't think concert attendance could be an indicator since there are lots of people who have bought their albums and never been to their concerts and don't leave out the people who have access to neither maybe they would buy a copy if given the access and the chance.
In other news, so many million sellers these days and to think that one of the first groups leading that trend may have never deserved the title
Sorry if I only focus on EXO, I don't follow any other group on that list