Why is Stevie so much bigger then her female peers

[Hawkeye]

I'm talking about people like Heart, Blondie and Pat Benatar. Even you personally feel any of those people were better or are better then Stevie (even I have to admit all three have maintained their voices better) The facts still remain that Stevie consistently plays in large amphitheatres while charging double what those other female rockers are and they're all generally playing much smaller venues at cheaper prices. Heart and {at Benatar songs are all over the radio as much if not more then Stevie, so why is the demand for Stevie so much higher?