Byron Katie is a new age guru. I wrote about her in one of the Krishnamurti circulars. You pay big money to get your ego crystallized. Same ol', same ol'. Werner Erhard, 30 years later. These people make a ton of money because there are so many gullible people around who have never been taught to look within...
So they look without -- enriching these so called gurus, to help them look within.
While some of Byron Katie's "work" may have helped some people, the fundamental issue with her work is that the ego remains -- and people I've met who are really into her are psychological monsters. Also, "the work" has some fundamental stupid flaws like saying everything that happens is perfect -- well try to say that to a person who was raped.