It appears that a bonus is in the eye of the beholder.
I would consider a free short story after the main book to be a bonus.
Apparently some people consider sample chapters a bonus. I don't.
(They can be annoying spoilers, if you're reading book 3 in a series, and assume the sample chapter is for book 4, but it's actually a sample of book 6 and gives away key details of the plot from the intervening books).
Count me among those who like to know when the end of the book is coming. Most books I read seem to have about 5-10 pages of junk at the end. However, I have run across a few that had 50+ pages (sample chapters, lists of other books, etc.) so before I start reading a new book, the first thing I do is open the table of contents to find out when the book ends and the junk begins.
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