The problem about that question is that it could be asked about any country and doesn't really have a straight answer. Different people will have different reasons why they'd like to live somewhere.
But, there are often common traits that would make most people not want to live somewhere.
So I ask you, why wouldn't you want to live in Italy?
English is required for a pilot's license as all air control towers are required to speak it.
English is spoken by a large number of people in almost every 1st world country.
English is the main language spoken in the United States which is a consumerism hub and if you want to market overpriced glittery stuff look no further.
Japanese is spoken in only two countries as a main language, but Japan is the hyper-tech center of the world.
Japanese Internet is almost completely seperate from the English Internet. Most websites designed for the Japanese do not allow foreign IPs to view their content. Japanese allows you to broaden your commercial reach to an entirely new, very tech-hungry market.
Chinese is spoken by the most people in the world.
Chinese is the main language of China, the most rapidly developing militaristic and industrial country in the world.
Ibanese is the official language of the
Iban people, a small African tribe.
Ibanese cannot be used commercially, as the tribe is not technologically developed.
Ibanese is spoken by very few people.
So, it's much more beneficial to know English, Japanese, or Chinese than it is to know Ibanese.
