The Elusive Attraction of "Feel-Bad" Movies: Disgust and Shock as Selling Points

Explore the world of "feel-bad" movies, or films which appear, to aim, first and foremost, to disgust, offend or shock its audience. You could focus on films like The Human Centipede franchise, especially because the third instalment is in the process of being released. Analyse how these films are marketed, how the content aims to attract (or rather repulse – and by doing so, attract) the audience? Why are people drawn to such films and why do they continue to be green-lit? Can they ever exhibit any sort of artistic significance or social weight or are they just gratituous exploitation and a waste of time? Other examples or case studies could include: A Serbian Film, the Saw franchise (especially the later ones post-Saw 2 or 3), Antichrist, Dogtooth, Funny Games, Requiem for a Dream, Salo. Or, in addition/alternatively, you could stray away from horror and focus more on films which dwell in the realms of sadness and suffering or leave your with a bad taste in your mouth or just, generally, sad. These could include: American History X, The Green Mile, The Mist, other von Trier works (haven't personally seen the older stuff, yet, but I have heard they are depressing), Melancholia, Seven, Gone Girl, Happiness. I am sure the list could go on and on.

Would most likely focus on film, but if you could come up with case studies from other mediums, go for it.