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Then you did more than what others would do. [Half of the members were not nearly so loyal as Kisame and Itachi himself did not join for honest reasons. In a way he feels...disappointed? That of them Kisame is the one who truly seemed to join for the correct reasons--though he knows he has not encountered every member just yet--and wonders if Akatsuki would have been less a threat had the others been more like him.
It is an odd thought to have at this point, when he's already made the decision to continue on in his mission should he ever leave this place. Whatever Akatsuki's true motives, Itachi will play along.]