The non-fiction bestseller lists frequently prove that we all want to know more about everything, even if we didn't know that we wanted to know - we're just waiting for the right person to come along and tell us about it.
One of the paradoxes of writing is that when you write non-fiction everyone tries to prove that it's wrong, and when you publish fiction, everyone tries to see the truth in it.
Writing fiction is not a profession that leaves one well-disposed toward reading fiction. One starts out loving books and stories, and then one becomes jaded and increasingly hard to please. I read less and less fiction these days, finding the buzz and the joy I used to get from fiction in ever stranger works of non-fiction, or poetry.
Fiction has been maligned for centuries as being "false," "untrue," yet good fiction provides more truth about the world, about life, and even about the reader, than can be found in non-fiction.
The problem with fiction, it has to be plausible. That's not true with non-fiction.