"In some places it's easy to lose perspective. But I think it's very easy to keep perspective in a place like Omaha," he said.
Buffett said being far from Wall Street actually helped him.
"It's very easy to think clearly here. You're undisturbed by irrelevant factors and the noise generally of business investments," Buffett said. "If you can't think clearly in Omaha, you're not going to think clearly anyplace."
http://www.businessinsider.com/warren-buffett-berkshire-omaha-2012-8
Looking to the rich neighbourhoods in Brazil, and putting everything else in the same framework, it makes sense.