Ultra-skilled workers in developing countries tend to make their way to developed countries in order to earn more. That leaves low/un-skilled workers behind.

Ultra-skilled workers in developing countries tend to make their way to developed countries in order to earn more. That leaves low/un-skilled workers behind. Both Romania and Bulgaria have been in the EU since 2007 and in two more years (2014) workers from those countries will be able to work in France without a permit. Romanian and Bulgarian workers can already work in many other Eu countries without those permits, so how many highly-skilled workers do you really think there are just kicking around in their home countries waiting for someone to come in an employ them at a wage much, much lower than they would earn if they took a train ride to another, neighboring EU member state? In other words, so much for the idea of teeming masses of highly-skilled workers in low-wage countries clamoring to be underpaid. That leaves us with the low-skilled, unmotivated workers who, as you said, need to driven practically like slaves (and worked much, much longer) to approach developed-world levels of productivity. That doesn't sound very alluring.