I think that many new words are invented out of a pure ignorance of writers. This is, of course, a generalization, so maybe it will be fair to put it this way: when I am writing I am ignorant to the point of invention of new words. How about that? I think it is a fair way to say.
I’ll give you an example. In the process of writing The Leap of Faith I came up with a great word, the word I can relate to, and if you’ve read my books then you know what I mean. And the word is encagement.