I am confused. are you asking if sonic youth do not go to south america because it costs them too much money to do so?/
or are you asking if they do not go to south america because they do not make enough money there?
either way it is a good question.
my guess would be that it costs them to much money to go fly all their shit and all their people over to south america , and around south america, just to do three shows.
you know they do make a living through the rawk right?