See, this is a neat idea for a contest in theory, but I'm not as big a fan of it in practice.
The reason for this, (and I'm sure I'm not the only one) is that I have absolutely no interest in many brands of eReader or file formats. I generally only peruse the News/ Commentary, Kindle, Calibre, ePub, and iRex forums, with a very occasional browsing of other devices (such as the Pocketbook and Onyx forums from time to time).
If they're randomly strewn about all subforums, it puts people like myself at a distinct disadvantage. I know it's just a contest so it's not that big a deal, but most people only care about the device they own or are thinking about buying, and while some people have practically every eReader out there, not everyone can afford that.