I agree. When I read this article I was shocked at the low compliance, but when I read the original offer... it didn't really seem like an "agreement" at all.

>My only request is that, after you read the book, you post a review about it somewhere. On your blog, on Amazon, on -- I suppose -- Twitter. Just let people know about it.

The final sentence reduces it to a "make sure you tell your friends about us", which one usually responds "Ok. I will" but doesn't really plan to do so.