I'm guessing that Michael never demanded the fee for the gaming license. He didn't need to--the brothel murder put Geary's coglioni in Michael's pocket. He' have looked cheap--small time--if he'd demanded the fee after Tom arranged his alibi. Geary might have inferred that if he paid the fee, he'd be free of any obligation to Michael. Better for Michael to say nothing specific--just keep Geary in his perpetual debt through Geary's fear that Michael could ruin him.