What is a new book worth? A lot, so long as it's a full-length novel in a series. That's been my learning so far. Novellas not so much, although sales numbers (if not royalties) can be boosted substantially by doing a collection with other well-selling authors. What am I talking about? See the chart below.
Among my regrets, of course, was not either preparing a number of books in advance or writing faster. Trust me, I'm writing as fast as I can. It was a shock that the Haberdashers became as popular as they did. As a series reader myself, I feel the pain for those waiting to see more in the series. The next phenomenon will be testing the response to a long-delayed book. I must assume that Saving Persephone will have even fewer sales, and will be lucky to bump the 5,000 line. Hopefully we will find out soon!
If you're a writer, what results have you seen in terms of sales of new releases and over time?