Americans and Western Europeans will never understand how insanely hard and bothersome it's to travel anywhere with a weak passport, let alone immigrate.
You want to study abroad? Show us proof that there is a quadrillion dollars in your bank account. Oh, an average monthly salary in your country is $400 and you plan to work when you arrive? You can't do that, silly, a student visa only allows you to work 2 hours every third Wednesday, and if we find out that you're working a second more we will deport you.
You want to work abroad? Better be a programmer, then of course you are welcome. Doctor, scientist, white-collar or, god forbid, blue-collar worker? You can fuck right off, your visa application goes straght into trash.
But if you marry one of our first-world citizens, then fine, you can come. Because we can't upset them, after all, they are a real person, unlike you.