The Asta is indeed a bargain. But the German cars, for example, are really solid. There are enough BMWs and Mercedes on the road in India that you've probably been in one and have seen. But is all that solidity worth it? Nobody is able to drive 220 anywhere in India, even where the roads are quite good. Conversely I doubt that Asta would be considered road worthy anywhere in the EU. Actually I think EU countries like Bulgaria and Romania would benefit from some of these super-cheap vehicles.
Bulgaria and Romania are EU countries — that is, under the same regulations that Germany has. Even if Asta was road worthy there, people from lower GDP EU countries would still prefer continue buying high-mileage, but somewhat well-maintained vehicles from Germany.