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This is a simple service. You send me the URL of your ebook. I send you the URL of my ebook. I buy and read your ebook and write a review on Amazon. You buy and read my ebook and write a review on Amazon.
I promise not to pan your book on Amazon. If I don't like it, I will write you my opinion privately (if you want), and I will give it a middling to good review. You, on the other hand, can be brutal in reviewing my book on Amazon.
Now what could be fairer than that?