No income tax?
Awesome history/architecture/activities/quality of life?
You can speak spanish, italian, french, english and who knows what else and have communication problems?
The beautiful people?
Lowest poverty rate in the world?
Most per capita millionaires and billionaires in the word?
Awesome stuff like f1 races in the streets?
Safe, not a constantly war torn country?
Nothing in the way of a communist uprising and being terrorist target?
The real question is not why pros live there. It's how much they must hate being away!