Think about it. Those of you who prefer reading Neale Donald Walsch's books like his style and his story. Those who like reading Marianne Williamson like her style and her story. Those who like Tolle like his style and his story. Those who like the books and talks of any other popular author/speaker, it's just a preference.
That's why people whose books sold well and were much talked about 10, 15 or 20 years ago have given way to others. Some, like Ram Dass have had a long lasting influence. Brian Weiss has had a lasting influence. So has Dannion Brinkley. What was the impact of Shirley MacLaine or Marlo Morgan? James Redfield, Dan Millman or Bernie Siegel? Richard Bach, Leo Buscaglia, Shakti Gawain or Margo Anand? Gabrielle Roth, Dalai Lama or Caroline Myss, Abraham/Hicks?
Popular author/speakers only get money from you when you buy something from them. Churches, on the other hand, ask you to tithe 10% of your income. But isn't following the teachings of one author/speaker or another, then changing, the same as moving from one church to another because you like the style of the minister or the feeling of the facility?