The amount of a book that is up for preview is pretty arbitrary. You can know in one chapter how some novels are going to go. In other books, the first half of the book can be heading a completely different direction from the second half. And are any number of chapters going to clue you into the "surprise ending"?
Therefore, the first chapters are only effective to give the reader a feel for the style of the writing, and introduce them to some of the characters. For the rest, you need a "tease," a blurb or photo that act as the commercial for the book.
Hmm...
I could've sworn there was a topic around here somewhere...
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