I ALWAYS read the last chapter or so of a book, usually early in the reading process. With favorite authors or series, I'll even read the end of the book before starting it. Why is this such a horrible crime?
This has absolutely nothing to do with being bored. If a recreational book is boring, I pitch it and read something else. Reading a story's conclusion is more a matter of knowing the end purpose - where is the author taking me? Bad news is tolerable, but I hate surprises, even good ones. In no way does this "advance view" lessen the charm or excitement of the story for me! Do travelers enjoy a cruise any the less for knowing their destination? It would be ridiculous to say they do. And what about those who read a book or watch a movie more than once? Do the "foreknowlege police" complain about that? No.
But, since most people are not like me, I am polite. If discussing a book with others, I never reveal spoilers without first checking for listeners who would be disappointed to learn story details in advance.
Yes, I also poked through the wrappings, and peeked at my Christmas presents as a kid too. Yet somehow I managed to grow up to be a decisive, competent, resourceful adult, who does not wine, sulk, or shortcut procedures for personal gratification. That study doesn't leave much room for parental influence and nuturing.
Kathy in WA