Unfortunately reality doesn't work that way, unless you don't mind destroying the local economy and you'd rather force rich countries to subsidize economically backward countries.
To put the money into perspective, $50/day, which might seem like a pittance to most people on HN, is almost 4-5 times the amount that most employees make at some of the better Indian outsourcing companies.
Because we make sure to keep it from working that way.
Rich countries don't seem to have much trouble with destroying 'backward' countries when it suits them[1], maybe Vietnam could use a bit of this kind of economic 'destruction' you describe.
