She's an excellent example of why mens art sells for more than women's. Women's art tends to be introvert and mens art tends to be extrovert. Think of how many famous women artists either focus on themselves or exclusively on womens bodies, or on the woes of being a woman.
Cindy Sherman, Frieda Kahlo, Tracy Emin, Tamara De Lempicka, Sarah Lucas, Le Brun, Jenny Saville, the list goes on and on...
They all focus on women's emotions and self image. Men, on the other hand, tend to ignore themselves and visualise the world around them, which is pleasurable for both genders.
Shermans fame comes from her tendency to portray both sexes. She appeals to women because of her constant "unmasking" of different personalities, which is a common identity problem among young women.