Maybe it's just your wife who's shady: no matter how much she loves you, it was deceitful of her to review your book so positively without indicating the connection between the two of you, particularly since that connection probably means she also benefits financially from sales of your book. But I suppose that's a bit like insider trading, which I hear is actually ethical and should be legalized[1].

[1]http://en.wikipedia.org/wiki/James_Altucher#Ideas_and_Theori...