Well floyd did a better job earning money than any other boxer by forming his own promotion so he is kind of a special case. Im thinking of the midcard to maincard guys in general.
point is conor didn't put much of a spotlight on something already known - top draw boxers make more money than mma fighters.
and even conor's ability to draw on a boxing card with a guy like paulie who would be dismissed by boxing fans, is somewhat unknown. conor in the ufc draws 1m+. conor against paulie is a possible failure. he'd have to beat paulie, imo, to reestablish himself as a possible boxing draw without having a bigger name attached than paulie.