I was checking out the Perfection skin demo when I noticed you can scroll down on the skin selection drop down. So you can only select the first three but you can't select the remaining skin as you can't scroll down for some reason.
This happens in the index page as the drop down goes down instead of going up as it does in other pages (such as the post view pages). I like this theme and I am considering purchasing it but that little buy is preventing me from doing so.