The point of the whole post: Not much, except to say that the book is too expensive. and that if you want you can either wait for it to be published in small and cheap size, or just read the pirate version from the pirate bay.
The point of reading first the last ten pages of a book: if the book need the suspense to be a good book, then it's a bad book which does not deserve to be bought because it won't be read twice. And I just can't resist .
Well, if a book is ONLY suspence, then I would agree with you. But I dont think a HP book is ONLY suspense. All books have an ending which you wont know untill you read it, so I dont neccasarily understand your logic, or agree with you. Plus you ruin the Book for the one good read you might get out of it...