I'm a well read grad student who's bluntly honest about all things, although I try to be most honest about myself.
You can read the give and take here, but the bottom line is that they're ignoring pleas for transparency and disclosure, and scoffing at us pointing out that not disclosing that you work for the website who's selling a book your reviewing is unethical, if not illegal.
Wow.
Their example of their editor's picks is not equivalent. We know you're selling the book already. Not so on a review, whether it be on site or on another site such as Booklikes.
Ridiculous. I'm done arguing with them, trying to get them to see that people will have problems with this, etc. Clearly they don't get it.