I've always figured single-word titles were attractive to publishers because they're easier to see from a distance. "Chosen" can be written in a font large enough to be read across a bookstore. The original title of that Belzoni book would seriously mess up the cover design.
(Of course, Belzoni-esque titles are still common in academia. Check out the articles from the
2015 IEEE International Conference on Robotics and Automation)