When you can't fight people at your level and you have to resort into bullying lowbies, stealing their 55 lvl RBs.
Lucky for us 50-65 lvl people ,some of you are stupid enough to get -4 in Forest of Mirrors.
It's basically what it says - you get 2 items which are both worth 200 million when selling to a shop. But you'd have to be a fool to sell them, it's an ultimate collector item.