Haven't read the links, but as an ex-expat in the US, I've done the math on importing a German car bought in the US back into Germany and the numbers don't add up: a used car of the same age is pretty much the same price as the cost of the car and the associated transfer, refit, inspection and registration cost, not to speak of the time wasted on the process.

Of course this doesn't apply if you buy a classic old German car or a high high priced Porsche or other luxury car. The mass produced Audi/BMW/MBs that sell very cheap in the US required quite a bit of a refit when you import them back to Germany,