As long as Mario's stealing franchises, he might as well take away the one thing his wayward brother ever managed to accomplish for himself. Why play Luigi's Mansion when we could have been sucking down spooks with the more likable sibling all along?

Mario probably doesn't share his bro's extreme fear of everything (he's certainly not afraid of success, unlike Luigi apparently is), so it'll be that much easier to exterminate the supernatural forces that plague the Mushroom Kingdom. Maybe Luigi can pick up some of the odd jobs on this list once his welfare checks dry up.