I read the end page first sometimes, or at least early on. I like a glimpse of where the story is going, but the ending lacks context, so I don't feel particularly spoiled. The fun for me is in seeing how the characters end up where they do.
I also re-read books despite knowing how everything ends. Do people who don't like spoilers not re-read books?
I don't like spoilers but I do reread books -- rereading a book is a totally different experience to the first time. If a book is worth rereading then it had more going for it than a surprise ending.