Good point! I guess I'm thinking in terms of dividing the market into 3 types of products: paper copy, locked-down DRM copy, DRM-free ebook. In 2/3 of those, Am

Good point! I guess I'm thinking in terms of dividing the market into 3 types of products: paper copy, locked-down DRM copy, DRM-free ebook. In 2/3 of those, Amazon and publishers don't compete. And on paper copies, publishers usually sell at list price with Amazon priced sometimes significantly less. There's also a 4th type which is the used paper copy, where publishers kind of by definition don't compete. Regardless, that's my admittedly naive rationale for why Amazon or other retailers shouldn't mind sharing review data with the publisher for use on its site.