Thanks everyone for your feedback!
Amarie, I can add your book to my queue if you like.
Which one?
NeuroFizz, I wouldn't say that I "delight" in finding errors, but I've gotten into the habit of looking for errors after reading and re-reading my MSs dozens of times. My brain has just started working that way. I don't speed-read, but I manage a book a week or so, going at snail pace. It doesn't help that my full-time job involves analyzing software design specs for issues. Too much analytical thinking maybe... hopefully that doesn't classify me as an asshat.
My goal of this thread is to gather feedback from authors who've already shipped a book to see whether my reader-feedback is useful and wanted, how it would be received, and who, if anyone cares. I understand now that authors may not want my feedback, especially if I don't add some value in some other aspect and sweeten the message with a healthy dose of genuine praise. Honestly, I would not bother giving feedback to an author whose book was so bad I had to stop reading after 3 chapters. I've hit a few of those, including a friend's Self-Pub'd book. What would be the point of contacting that author?
Phaeal, I think the reasons I'd volunteer the feedback are: for the love of the art and the profession, and a pure appreciation for the dedication it took to produce a story that I enjoy. I'm the proverbial "kid in a candy store", and every time I read a well crafted story I get a feeling not unlike the joy of Christmas morning.
I would hope that my correspondence with an author would inspire or reassure her that a thoughtful audience cares what she has to say. Since I care that the author is successful because I love the book, I wouldn't dare publicly post on Amazon that I found 25 typos... but that gives me an epiphany...
Why am I not writing detailed reviews on Amazon of the books I read and liked? *facepalm*