Marvel has built their movie empire partially on anticipation and excitement among the core fanbase. Marvel has a tradition of post-credits scenes after their movies, ever since the first 'Iron Man' movie introduced Samuel L. Jackson as Nick Fury and name-dropped the "Avengers Initiative." It's worked out quite well for Marvel. And, while DC and Warner Bros. are very eager to catch their competitors, don't expect them to follow suit. When Warner Bros. asked Zack Snyder and Christopher Nolan to add a post-credits scene to the end of 'Man of Steel,' Nolan told them, "a real movie wouldn't do that."