If it is from an author I enjoy, then yes. If I've never heard of it but the title catches my eye, then yes. If it is something written by someone whose opinion I value, then generally yes.

Occasionally. But only if I have something to add. Most reviews don't really lend themselves to discussion, and I generally don't feel the need to tell people what I think...except in this survey

I don't know that there is a lack of appreciation, but more of a lack of something to say. I go back to what I said about reviews generally not lending themselves to discussion. Sometimes, I think people just want to see what someone else thought of a book and then move on. I suppose you could harass Ben into putting in some sort of "Like" option thingy like Facebook has

Free candy with every page view?