Of course it is a measure when their earnings are so tied up in their music career.
It's not even like people in here drag solely based on music stats. Whenever one of the girls ventures into film that gets used as well. Not to mention endorsements, and let's not get started on Forbes.
So why is this an exception again? I could understand someone's point if it was like a Julia-Louis Dreyfus tea where they just happened to be heir to some fortune totally apart from their actual career, but that isn't the case with any of the girls we discuss in here.
The Navy tends to devalue something Rihanna lacks in comparison to her contemporaries.
Money? Not important.
Touring pull? Not important.
Starpower? Not important.
Dignity? Not important.
Relevance in Asia? Not important.
Respect from Australia? Not important.
etc.
No pop artist aside from Michael, Madonna and Janet are truly original, although Madonna did steal quite a lot but her music was very innovative and made up for it.