Not every author can do this: invite real readers, who have paid money up-front for a book, to edit and improve the manuscript before it's published.
But crowd-funding makes that possible. As well as taking brilliant suggestions from the editors at my publisher, Unbound, I sent the finished work to 25 subscribers, asking them to tell me what they liked about the book, and what they might like to be different. And then I made some very big changes…
(Recorded live on www.Periscope.tv/jpflintoff, on the book's publication date, to let those reviewers know what effect they had. Several were watching me in real-time.)