Maybe the Balkans just didn't have the time to reach those levels yet, because the tendency is there. Case in point, Romania, where more and more pieces of land (city, national parks, whatever) get fenced off and used for the whims of the ruling kleptocracy, while (certain) suburbs are decaying year after year by every indicator.

Romania is actually the least corrupt Balkan country (if one counts them as Balkan). In my experience, former east-block countries tend to have high corruption, but relatively good infrastructure and relatively low inequality. They're fairly unique in where they sit on the development ladder, because it seems like quashing corruption is the major missing piece to reaching prosperity. (Whereas in many / most poor countries, there's a lack of intellectual capital, and solving education and growing the professional sector is at best a multi-generational project.)