Ewan Morrison wrote this the other day about fanfic (which is what 50 Shades is).
My view on fanfic? Creating a convincing character is one of the hardest parts of writing a novel. You think it's a 'homage' to use someone else's character*? That makes you both lazy and a thief.And I prefer that you keep your masturbatory fantasies to yourself.
*I feel that there are probably exceptions to this where the character is not the main one and it is being used creatively. Jasper fforde for example. Can anyone think of anything else?