When you buy something or choose a university, we often pick what is deemed the best around the world (subject to affordability ) eg Korean hand phones (Samsung), German cars (BMW), American laptops (Apple), Japanese airconds (Daikin), Thai rice (Jasmine rice),French wines , British Universities (Cambridge/Oxford), ect2 -so why not your spouse?
Many people made the mistake of marrying their class/schoolmates or workmates and later become disillusioned when they travel and see all these more attractive women form other countries.