Okay then! A new perspective on the phenomenon.
The Mrs. went to a 50SOG toy party last night. The idea was the women would have the party and the guys would show up around 9 to go out afterwards. I show up and the girls are all wearing t-shirts with, "Laters Baby" and "Charlie Tango" on them. Little 50 confetti everywhere. Mind you that we are the seniors by 15 years at this party. Upon walking in I am accosted by my wife's coworker with a big hug. She also knows that I am reading the book. She turns to introduce me to the other guests and before she can say my name, I pipe up with, "Hi, I'm Christian Grey" What was one woman hugging on me became a dozen women. All clamoring about how wonderful the book is, while their respective 20 something guys stood slack jawed, puds in hand. I felt like the silver back, and through the course of the evening I shared time with the ladies while they watched. I attempted to point out the faults of the book and the overwhelming response was, "Who cares, it is incredibly fucking hot!!" I even pointed out how incredulous it was that on her first attempt at a blowjob that she, A. showed no signs of a gag reflex during a deep throat and, B. Had absolutely no problem swallowing her first go at it. The general reaction was, "It made me want to do it."
I guess, despite it's faults, the book has a firm hold in society today.