In talking to hybrid writers, I did miss something. It only concerned a handful of writers, and most of them only wrote one series. These writers would email me after they had indie-released a new book or two in their existing series, and complain that the series wasn’t growing.
When these writers were traditionally published, the series grew well. Each book sold better than the last. Now, even taking into account the year or so of sales, the books sold at the same number of copies or less than the previous volumes had.
I couldn’t figure it out…