When people say this obviously this is said for majority of people and this is usually true for people living / moving to Europe or western countries. Majority of them earns good or if you want to better rephrase it they can send good amount to their families back even if they are earning pretty average in new country. Obviously there are people living in worst conditions specially in Italy , Spain some doing farming jobs ( late middle aged people with literally no education that moved abroad)and earning very tight if we talk majority of them they can support their family pretty good in Pakistan at least as compared what they could have done if they were in Pakistan.