I'm struggling with the logic of bringing up Pink Tape being 28th last year.
Like, what, should they just not have girl groups since they don't sell as well as boy groups?
Personally I think f(x) have the most realistic sales, when you take out ridiculously huge fan bases (Sones) and horny tween girls (Exotics, ELFs). Kind of like an industry foundation level, where any girl groups doing above PT's numbers must be doing really well.