Why is it remarkable the Gatsby has real books in his library?

The Great Gatsby chapter 3

Nick Caraway meets the man with the enormous owl-eyed spectacles in Jay Gatsby's library, during one of Jay's parties. Nick and Jordan had politely left their company to find Jay. ... This is the reason why the man with the spectacles is so surprised that the books are actually genuine. He expected them to be fake.

Explanation:

Gatsby's saving grace is that the books and the library are not to show off to everybody - just Daisy. They, like the wealth which has bought them, are merely a means to an end: his dream of winning Daisy back. So the books symbolize Gatsby's vision of himself and his dream but also the fact that they lack true depth.

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