Who Thought of This?

I was looking at boots on Amazon.com when I came across these. At first, I thought there was something wrong with the photo, but it turns out that these are some sort of festish item. They are a cross between a ballet shoe and a spike heel. To me, they seem far more gross than sexy, but Amazon.com had several different pairs for sale (there's also a knee high version) so they must be a turn on for someone.