> Europeans with adult stable jobs fly Ryanair and Easyjet because this is the best that they can afford on European salaries.

Nonsense. It's because they're sufficiently cheaper on certain routes, and when you're taking multiple trips a year, the price difference accumulates; and also because they have very good point to point service, so if you live in a non-hub for the national airline city - a Bordeaux, Lyon, Birmingham, Manchester, Edinburgh, Hamburg, Köln, Varna, etc, your flight options are a flight with a connection in the hub, or a direct flight with a low cost carrier to a destination.