Interesting, the countries in the sun belt of Europe: Spain, Greece and Italy have the highest live at home rates, they also have some pretty pricey real estate due to demand from Germany, the UK, and other northern Europeans.
I guess it's more likely about the culture and family values rather than the economic facts when it comes to countries those called to have meditterenean culture (Spain, Greece, Italy and a bunch more). ie. in Turkey a guy is simply not expected to move out until marriage.