It's a good idea. I certainly don't have any objections to hard mode (see: the futility belt). And it's super easy to make jokes about things being terrible
My concern with making them Items of the Month is that people will want to compete at it and making it an IotM will naturally limit that. I'd tend towards making it an item that's permanently present (like the avatar frame). Pandora's Box, probably, because that's perfect. Something like you can use it to unleash one apocalypse of your choice, so we can add more later and still have the old ones be available.
It's not on my agenda at the moment, but if people are excited about that, let me know and I'll see what I can whip up.