Amazon’s “Read Sample” – Too long or too short? Any potential use as a marketing tool? Any tips on how to change its length?

You’re familiar with Amazon’s “Look Inside” feature that allows you to preview the beginning of the book. KDP calls it the “read sample.” Did you know that the sample is set by default at 10% for eBooks, with the ability to be changed from 5% to 40% in 5% increments. Hard cover and paperbacks are set at 20% by default with the ability to be changed from 10% to 80% in 10% increments. Of course, if you have Kindle Unlimited and are looking at a book that is in Kindle Unlimited, the entire book is free. But, today, let’s look at books that are not in Kindle Unlimited.

N.B. A search on Google for instructions for how to change the read sample length provides instructions for doing it through the KDP bookshelf with editing book details. It doesn’t work. According to a KDP discussion group, it must be done by contacting support and asking them to make the change. However, good luck with contacting Kindle support. I finally reached a person. She didn’t have an answer. Nor did her support have an answer. I was referred back to the page where I had just come from. An eternal loop. Ugh!!!

Now that I have cooled off, here are the questions:

As a Reader: When you are considering a book to purchase on Amazon, how would you rank the importance of the cover vs. the book description vs. the read sample? Do you wish the read sample were longer, or shorter?

As a Writer/Publisher of a book: Do you think the read sample is too long or too short. Do you ever change the length of the read sample for your books. Were you able to do so through the KDP bookshelf, or did you have to contact support? What are the advantages or disadvantages of a long or short sample? And, have you ever thought of using the read sample as marketing tool with a plot twist or cliffhanger at the end of the read sample?

Please give us your opinions: Any and all thoughts on the read sample are invited and appreciated. Also, any thoughts on Kindle support are also welcome.