@guess who: The financial analysis is even better than that. If a fully-exploited worker can work 80 hours / week, then one robot could conceivably replace not one, but two workers. So if the cost of a human-replacing robot is 3x the human's salary, then payoff is in ~1.5 years (ignoring maintenance and power costs for machines, as well as food, healthcare, housing, plumbing and other costs for humans). That time span is so short, NPV calculations aren't even necessary.
What I'm now left wondering is, why didn't APPL think of doing this? In one fell swoop, they could have stopped "outsourcing jobs overseas", condoning worker exploitation, condoning unsafe working conditions, condoning child labor, and all other manner of unspeakable bad things... and they could have even SAVED MONEY. Cook should be kicking himself right now.