I wrote, as you said, fiction and non-fiction. I find personally that it depends. Some people prefer to read biographies; others are more into novels. I think that when I started writing novels, it opened other sorts of readership to me, and this also developed into more visits to festivals. I think non-fiction is sometimes restricted to personal stories.
In turn, that should have been more beneficial for me in terms of royalties. Unfortunately, I don't think that.... With these changes, our cheques are very small and our benefits are diminishing.