As a Bulgarian living and working in London for more than a year now, I have no intention of going back. The IT sector in the country is booming and the money you can make relative to the cost of living is insane - you can live like a king. To me that is not enough. Money are not enough to make me go back, even though I miss my friends and family. One of the biggest problems for me is that the country is stuck in this perpetual battle between western and Russian influence and that the government on all levels is mafia. There's a lot more that can be said, but speaking for myself and some friends/family that share my opinion that's not going to change soon.
EDIT: mrtksn's comment paints a very good picture.
EDIT: mrtksn's comment paints a very good picture.