What do our top tax collector, the chair of the holding company for a major South African  bank and one of the country’s most powerful businesswomen have in common? Besides knowing a thing or two about raking in the  moola, they’re well versed in the value of art.

These three bold type-faced names were among a throng of well-heeled guests who converged at the old offices of a leading law practice for the VIP opening of this year’s RMB Turbine Art Fair...