I can think of a few voluntary exchanges that are exploitative. For instance, if I offer someone a life-saving drug if they give me their house - they can volu

I can think of a few voluntary exchanges that are exploitative. For instance, if I offer someone a life-saving drug if they give me their house - they can voluntarily enter the agreement, or not. I think we can safely say that in at least in some cases we can clearly judge that a voluntary exchange is exploitative. Do you feel like this is not one of those cases? Why?