I have a Kindle and I buy loads of e-books. Like many of you, I often download books to support fellow authors, even if said book is outside my area of interest. The backlog of e-books I own is, well, it's embarrassing. Amazon sometimes informs me that a new version of an e-book is available. "Significant editorial changes have been made," the notifications usually say. The frequency of these has been increasing, but I rarely take them up on it. The reason I don't is twofold. Partly, I don't want to lose the original version of the book, and the update is apparently an either-or proposition. If they'd give me the updated copy and also let me keep the first, I'd be more inclined to accept. The other reason I decline is on principle.