An excerpt may not be a bonus you like, but it is a bonus. It would only be a lie if it gave you nothing extra at all. A difference of opinion on what constitutes a bonus doesn't make it a lie.
I find it a bit jarring to reach the end of the book with a significant percentage of the document remaining. How much is left gives me a feel for my position in the story. I can look at what page I am at if the book supports page numbers, but that is independent of the percentage. I have to click a button to see the page number, but the percentage is always displayed. If a book has a large number of notes at the end of the book, for example, I might reach the end of the main part of the book at 85%.
If the percentage was based on the percentage of the main part of the book, that would be an improvement. It would be a great help with bundles. Let's say I have a 10 book bundle, the percentage will show the percentage for the entire 10 book bundle. It would be much more useful to have the percentage of each book rather than the percentage of the entire document.
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