Amazon quality control
So it seems there's been a change at Amazon. As of a couple of days ago if readers complain about poor quality e-books, a notice will go on the book's landing page to warn people about it.
When I say 'poor quality' I mean poor formatting, typos etc.
"The combined impact on the reading experience of a book with excessive Distracting or Destructive Issues can lead to the book being removed from sale until the corrections are made. A moderate amount of Distracting or Destructive Issues can result in the book remaining available for sale, but with a temporary quality warning displayed on the detail page of the book on Amazon.com until corrections are made."
Some of the issues Amazon gives as examples of things that will cause a quality control sticker to appear on your landing page are numbers in place of letters (and vice versa), incorrect punctuation or 'cover issues' (blurred images etc).
Personally, I think this is good news.