PC: Poisoners Wingblade?

Well, first, I didn't even know there were poisoner mods for swords. That being said, I have not even seen any poisoners mods for swords being sold. Is it just because it is a terribly bad mod, and most would get more gold by selling to the merchant? I've got a 15-22 purple wingblade with a newly unlocked poisoners mod. Would that be worth more than the gold it took to id it?