Well, I didn't mean as a writer, but as a fellow reader to support other writers (I don't think an author writing a glowing review about his own book would be taken so seriously).

I don't like their business methods either, although - like you said on the page you linked - as a consumer I recognize the advantages of buying there, but not writing reviews if you want to support another author simply ignores the prevalent powers they have, because people like us remain customers there.