I think many who are more than just casual fans of the sport have heard that Evert was not as squeaky-clean as her image. That's not news.
My personal feeling is that the fact that she got pregnant by Jimmy and had an abortion is at a whole different level than that. I don't think it's the end of the world, but I'll go so far as to *not* buy this book as a result.
I'm sure this will gain him more money than it loses him, however.