I would hazzard a guess and say that the guys comming back to SA from the midlle east do so because they've been out of the country long enough to earn some real money, see the world and probably have enough cash to buy a place at Clifton or Camps Bay. Home will be home for most and only a small minority will not come back to SA.
They choose CPT because of the beach and the hill, the waterfront and the little traffic. No stress until retirement is the philosophy here! Dont get me wrong, I like Cape Town too.
Judging from figures in one of the other threads about CPT tfc movements, CPT is the place to go and relax. Maybe that's why they choose CPT above burning out on the Reef.