An interesting theory that I've heard a few times and that I give no credence to (But love just the same) is that the Fae are, in fact, the same thing as angels and aliens. Something so completely different from our world that we automatically categorize them into something more believable for us.
The legends, the lore, the regal and horrific blended into one. There is nothing about the Fae that does not appeal to me and I even wrote about them in my very first novel, UNDER THE OVERTREE. They are not the faeries you remember from your legends but they are the Fae and even follow some of the same rules.
Highly recommended read: Raymond Feist's FAERIE TALE.