As someone who paid real money for this book, I am not sure how I feel about this...
You don't have to justify anything to me or anyone else: If you personally feel uncomfortable, I personally want you to get your money back. You can always change your mind and buy it again if that's what you want to do.
Your book is excellent and I wouldn't dream of asking for my money back.
If you just say "oh well, I thought $1000 dollars was a fair price" and think no more of it - well you are a better person than I am!