Exploitation and double standards in research in developed countries

If it is so obvious that international participants should share in the spoils of research profits, why isn't it equally obvious that participants who share nationality with the researchers should do so as well? I argue that if one believes that some form of benefit-sharing is morally obligatory in research conducted in developing countries, it is very hard to escape the conclusion that it should at least in some circumstances be thought equally obligatory in research conducted within the borders of developed countries. I show that untenable assumptions about solidarity and altruism within developed countries are relied upon to deny fair treatment to research participants in developed countries - treatment that would be considered exploitative if meted out to citizens in developing countries.