The point you're missing is this... Dar doesn't scream, to the world, "I'm this! or that!". But when people in the diaspora happen to get a taste of it, they never wanna leave.
It's not just how massive and clean the city is, but its culture, the people, the language and (of course) the food, its healing energy and and how much the dollar can stretch far and wide. They are surprised to learn, they can afford to live in mansions full of different fruit trees and a walking distance to the beach. And the fact that they can have a "dada wa kazi" and mlinzi, makes the whole experience supa dupa fly, and they are just regular folks.
Lastly, we speak in a soft rhythmic voice, it's very hypnotic to the ear and Tanzanians in general are very polite people. These are few reasons that make our city stands out.