Because the entire industry is so inflated album sales paint lies.
If this was 2008 BTS most popular album wouldn't sell a million copies. They might hit 900k but that's it. Prime TVXQ (who is only a hair below Prime Bts) best album sold 600k.
This also makes it look like BP is bigger than Prime TVXQ since they have an album over 1 million and TVXQ does not.
BP is not bigger than peak TVXQ lol.
Can you believe this free education I'm dropping 4 days before public schools goes back in session?