From my view: Not all wealthy expats/locals live in gated communities.
Many live in Buenos Aires in luxury or large appartments in Puerto Madero, Recoleta, Palermo chico or else...
And they have gated "weekend" houses in the Northern "countries or barrios" (there are literally hundreds close to Pilar or Pacheco) which they own or rent to have during the year but live in BA.
Drivers are not so common except for the very very wealthy, hig ranking diplomats or businessman, but most dont .... they have their own cars or call radio taxi services .... and also it is not so common so it may attract attention.
House help yes, most middle class families hire someone to help in the house so imagine the wealthy: they will have several maids, gardeners, etc..
Their kids tend to go the highest ranked Bilingual schools. (st Andrews, Lincoln, etc...)
The locals will have vacation homes in Uruguay: Punta del Este or San Ignacio, or in the Argentine coast in Cariló or down south in Villa Langostura, or others...
I dont´ know exactly how much does it take per year to live the good life,
But am sure from previous posts you can manage it