I don’t know JA Konrath personally and I haven’t read any of his books.
I learned about JA Konrath a few years ago reading volume two of The New Writer’s Handbook. In it he published an article called “Sling Your Web” in which he discussed driving traffic – the blog and website kind.
At the end of the article there was a blurb about Konrath, mentioning his 500 rejections, nine unpublished novels, website and blog. I will be the first to admit that I’m a nerd so of course I checked out his website and blog.