This is an interesting point, in regards to hiring someone from (rural) Japan to take care of customer service. I suspect a difficulty you would face is finding someone who speaks English well enough to serve your English speaking clientele.
Along this vein, I'm in Taiwan this summer, and it's striking how cheap labor is. An English speaking, sometimes even US educated, assistant costs $600 per month. That's very low, and competitive with higher end VA rates.
But you would have trouble finding labor of that quality on eLance/oDesk/etc. You can get a $400-600 per month VA, but English quality will be relatively low.
I wonder if there is an untapped labor market of quality English speakers in "2nd world" countries who would gladly work from home for $600 per month, but have not been exposed to the opportunities online. How do you tap into that workforce? How do you expose them to a labor sink that is a clearly a net positive value prop? And how do you filter the workers/employers such that both are happy with the arrangement?