"It's ironic that Ikea looks on the U.S. and Danville the way that most people in the U.S. look at Mexico,"
Not really. With Ikea furniture being so cheap, so heavy, and so apparently labor non-intensive (only three hundred employees at the factory?) the main advantage to building furniture in the US rather than Sweden is saving on the cost of shipping US-bound furniture across the Atlantic rather than saving a few bucks an hour on wages.
http://en.wikipedia.org/wiki/List_of_countries_by_GDP_%28PPP...
The low end in Sweden is based on the local minimum wage and the vacation days are mandated by law. In the US IKEA uses the room afforded by the law there to pay their workers what they can get away with.
Clearly these are not 'average' Americans or Swedes we're talking about, we are looking at the low end of the curve.
Cost of living for those American workers is likely not all that much different from their Swedish counterparts.