It's all calculated by math. The only ones looking foolish here are the ones discrediting Katheryn's success.
PRISM sold 3.6 million and Roar and Dark Horse are the kings of radio, streaming, and sales.
Not to mention she was credited on Britney Jean, The New Classic, and The Pinkprint. Where is the surprise gorls?
this isn't even reliable if it's about success. taylor was quite likely the most successful artist of the last quarter of 2014 (based on shake it off, blank space, and 1989's sales), so she would be way higher than she is...