What is it that trolls truly want? Attention. And you're giving it to them. Any true troll that gets nominated will just feel validated in their actions, especially if they win. The worse thing you can do to a troll is completely ignore them because all the want is your recognition and this thread is giving them all they want. Ignore them and they go away defeated. Entertain them and they keep going because that's how they get their kicks.
I considered this. A true troll never completely goes away, at least not without a fight. They're going to keep on keeping on whether this poll existed or not. Most trolls will claim they are not a troll, so I don't know how validating the title of "biggest troll" is to them.
Besides, as this poll is inclusive of any member that has ever been a part of this forum, its a chance to recognize trolls of the past for their magnificent achievements in trolling. Its not limited to active trolls.