So
almost everybody career is based on image,
that's what it sells
Britney was labeled as the princess of pop, and then she sold albums like crazy
while Christina had to work her butt, has talent but in some countries , people kinda ignore her
Evanescence came in the right time, it was something fresh, and sold like crazy, nowadays they are not SO HUGE, but they decently sells
nowadats to sell
IMAGE > MUSIC
but well, everybody has their musical taste, and at least she compose her own music, and there are people who enjoy her music
so