She is not suing all of her fans, I mean, when I was reading her books it's not as if I did it from some kind motive to make JK Rowling famous and rich, I did it because she write great books that I wanted to read.
Buying her books or reading them give me the right to do just that - buy and read the books - it doesn't mean I'm allowed to use the material in them to produce similar books and make money by selling them.
I'm an artist and if I find someone's been copying my work, I'd be very upset and might consider a law suite, whether it's done from admiration or greediness is beside the point.