Money talks, lol. And yeah, there's nothing rare about a weapon that most of the veterans here have. I haven't played an RT game without someone wielding a dark weapon. Not that there's anything wrong with that, its just not that uncommon. Now if you come across an unused PGF, then it might be worth a pretty penny, IMHO.
Here's a thread of the last PGF auctioned here. It went for a LOT.