In the Knightfall series, the following events occur:
Bane discovers that Bruce Wayne is Batman. Bane proceeds to confront Batman and breaks his back.
Why wouldn't / didn't / hasn't Bane revealed his knowledge of Batman's secret identity?
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Bane, from what I gather, isn't in it for the money or fame/infamy he'd receive for outing Bruce Wayne as Batman. Quoting Wikipedia:
His ambition turns to destroying Batman, about whom he had heard stories while an inmate. He is fascinated with Gotham City because, like the prison, it is a place where fear rules—but in Gotham, it is the fear of Batman. Bane is convinced that the demonic bat that haunted his dreams since childhood is a representation of the Batman.
He's only in it for the challenge, to rid himself of the demonic bat figure, and to take control of Gotham. He has no need to meddle with Bruce Wayne.