I wan't arguing that no-one would ever do it. We already know that Purple Lady is doing it. And, if you do have Google books installed, then sure, show the active function.
My only point was that probably most people don't install it, and even in your use case, the person is going to have to install google books twice and then send the book and receive the book. Its probably easier for them to use the send-to option and just email the book.
Like I said, I don't have any personal problem with having it there, I just think if the majority of people are only ever going to see it greyed out, and are never going to install google books, it might be better to just hide it.
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