I have to agree with leo here. In China, you'll find adverts with Chinese people in them; in Egypt (because I've been) you'll find adverts with Egyptian and other African (black) people in them. In a country that is predominantly white, you'll find adverts with white people in them.
It's just marketing, and whilst it may appear "racist" for us, I suspect it's probably because we live in a multi-cultural society used to seeing black people on adverts, an generally in society.
It's just marketing, and whilst it may appear "racist" for us, I suspect it's probably because we live in a multi-cultural society used to seeing black people on adverts, an generally in society.