The world is 'ICAO', not 'JAA'.
Do you think that a S. American Captain (as an example), who might earn USD2,000 per month back home, is going to refuse USD5-6-7,000 USD in another part of the world whilst he has a mortgage to pay and wife & kids to feed?
He is not dis-crediting his profession, he is taking a contract for better money than he can earn at home. JAA 'at home' salaries are significantly higher thus best you stay at home, unless the deal it right for your mortgage, your wife and kids, but please don't criticize others.