Why WWJD?

I've recently been doing some research on the origins and popularity of the "What would Jesus do" phrase. While it has become hip and cheap today, it gained real popularity in the early 1900's after the publication of "In His Steps."

According to Wikipedia..."Chicago Advance, the original publisher, failed to register the copyright in the proper form. Other publishers took advantage of this, publishing the book without paying the author royalties. Thus lower prices and multiple publishers led to larger sales."