In the hifi making scene, we are having a 6X margins rules. It will say that you will sell your hifi gear around 6 times the prices of the components for making (you and your retailers) a good margin.
So it's obvious. If your speaker enclosure costs 250$ to make there in USA/Germany/France, then you will, at least, have a 1'500$ price for selling it and you have no speakers and no developpement counted in those 1'500 dollars.
So it is only logical that the great ones are going to make their cabinets for their "entry level speakers" in the asia market. Not only because it's damn cheap (around 25 $ for a finished enclosure), but because a lot of components are available directly on those markets for cheap. Speakers, elctronic components and labour forces. This is the only possible way to make massive margins and selling you for a price you will see as OK.
Le'ts be clear, in the 21 century, peoples want average price/performance and not quality nor homemade speaker enclosures. They are looking at the small price and the flashy finishes. So the builders will sell exactly that. On the middle and higher end market, you will see more and more "home market made speakers". Because it is, at a certain price, becoming interesting to have the logistic and the fabrications process close to you and the buyers of those gears, are more looking about quality, originality and finishes.