Why not, if your profits are already guaranteed? Few nations around this world have the kind of regulations for so called quality control than we do. Patents also play a part in the cost of meds... There is advertising costs, and buying politician costs.. NOT all costs are specifically related to research and development. Plus in socialized nations they have a monetary amount set aside for the majority to cover the cost of meds.
If my profits are guaranteed, I'd sell for more overseas.
So why do they sell for less? You really have no idea?