It is also so obvious in many English speaking countries that they use English to control entry of professionals from non-English speaking countries into their labour market. This is a techique to control entry so that that they can create high demand of their own local labour. In such situation, professionals from non-speaking countries are excluded not because they are not good in speaking English but to maintain low supply of labour in their country.

Result, will be high salary due to high in demand. It is nothing to do with the actual speaking in English.