Yeah... I think it all came from the huge success of 50 shades of grey that Amazon decided to act on that.
However, I'm with you... if I write something- especially fanfic or the likes, I wouldn't want to publish it (I know, weird) but would do it more for those in that fic circle.
I also thought I had read something about amazon getting certain rights if you publish with them. Which in turn, could hurt an author further down the road if it made it to the 50 shades of OMG level.

I think. But don't quote me on that!

Now, if I wrote an original novel or something (not fanfic) then of course I would want it published- but not as an e-book!
