Why does Julie Ellison have a Permathread and not all of the hundreds of other folk singers out there?

I must confess that I've never heard Julie Ellison. In fact, outside of Mudcat, I've never eaven heard of her. So I'm not saying she's not good or anything. This is not a flame against her?

It's just why Julie Ellison and not Jean Ritchie or Eve Goldberg?