Problem is the funding never gets passed on as a savings to the American consumer who needs the treatment.
(Not that polices to reduce the cost to Americans, especially relative to foreign markets, ought to be unpopular)
1) Many other countries don't have the ass backwards healthcare system that we have 2) Then there are the poorer countries. It turns out that things like providing them cheap food & medicine manages to a) provide a source of soft power & influence in the world, and b) helps us by helping them by limiting the spread of various diseases and maladies