Wow, I'm really impressed with your sales numbers. Receiving more than a hundred dollars each month and continuing to see sales growth is to me, a very appealing picture for a new author.
You've got me thinking about a non-fiction book that I had pitched as a book proposal years ago, before I got serious considering self-publishing. It's been packed away in the filing cabinet (and hard-drive) for several years now.
You broke down your sales by item sold for the early months and at that point your mystery was selling the most quantity wise. Is that still true? Or have your non-fiction sales grown? The sales growth seems fantastic! I realize that not everyone is seeing this kind of response -- in fact, I'm pretty sure there are many folks who have more like single-digit sales each month. But your results have opened my mind to the possibilities for real income.