I don't know why you have made consideration of thinking of both Beverly Sibanda and Zoey (Noleen Sifelani) as Zim socialites. Personally I don't see how Beverly Sibanda fits the description of being socialite because she is less known and a bit obstreperous too, by the way.
Also, you can't compare Jackie Ngarande to Faith Nketsi because they are not on the same level. Faith Nketsi is more famous than Jackie Ngarande and commands a premium price, unlike Jackie Ngarande.