you can't compare the salary of one person in one country and the profit margin made here. yep, it might still be the margin that wins. but if the worker in his/her country has a salary in harmony with his/her country's costs of living, then it's kinda of grand. what you want to fight for is to have workers would, despite the fact that they work 10h per day, only earn enough money to buy themselves just about enough food. as for rest, they live in slums with no electricity or running water.
in all fairness, this is something we're facing too in the western world. how come some in Europe or America have to have two jobs now to meet month ends? we call them "travailleurs pauvres". "poor workers". they're that badly paid that despite the fact they work, they don't have enough money to pay for all the basic essential things they need. that's revolting. It even reached this stage in France where a friend of mine was better paid through the dole than if she had accepted a job as a translator. and nope, it isn't the dole that is extremely high. it was the job that was extremely badly paid. that's just fucked up.