I wouldn't necessarily say that wanting to pay an employee less is "exploitive," just as I wouldn't label an employee's desire to make more an attempt to exploit the company either. I'm just saying that those are opposing goals that are going to make it difficult to build a fully aligned relationship between the two parties.
Not sure I really understand how this position relates to the Dark Triad concept. I thought that these days DT was really only bandied about by people in the pick-up community with something to sell to frustrated men.