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Aside from the legal issues, which I admit may be considerable, how will reading the book "spoil" it?
If you picked up your Harry Potter at midnight this Friday and began to read it, would it have "spoiled" the book for the millions of people who didn't get theirs until Fedex delivered their copies from Amazon? How about those who were forced to wait six months longer until they could check out a copy from the library?
If you read a bootleg copy a few days before the official release, how will reading it early "spoil" the book for you?
Now, I can understand feeling some annoyance if someone were to tell you crucial plot details, like The Ending, before you had a chance to read it for yourself. But, if you skip right to the final chapter of your own legitimate book when you receive it through normal channels and read the ending, have you "spoiled" the book? Is it somehow no longer worth reading?
If I had my hands on a copy of Deathly Hallows at this moment, I would read it. Maybe I'm just spoiled.