Well, there probably are millions of Americans who ARE interested -- at least a bit.
After all, despite Republican attacks on him and Trump's false claims about Barack Obama supposedly being born in Kenya, a majority of American voters elected Obama president in 2008 and reelected him in 2012.
YOU -- and lots of people like you -- may despise both Michelle and Barack Obama, and have no interest in Michelle's new book. But really large numbers of voters turned out to vote for Obama during his two runs for the Oval Office. And isn't it likely that some of those people are interested in Michelle, and are willing to pay good money for her book?
-- democratic socialist for Bernie Sanders' politics, and for common sense