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I'm not sure how much to trust a source called "The Investor" since the bias is obvious, but it depends on how much a "grant" is. Bloomberg's report last year (which had quite different numbers, so either things have changed tragically in under a year or this site is misreporting) says the average is $23 US per month which could be easily sustained depending on what taxpayers normally pay. (Plus there are other revenue sources, which Bloomberg noted was buoying everything.)
If the bill exceeds tax receipts then the end result will be a hit on the exchange rate(as the govt. prints money .. sorry, engages in quantitative easing). That affects imports, so the question is :- 'how reliant is South Africa on imports ? That will determine if this model is sustainable or not. >

Yeah blame welfare and not the decades of racism. Gee I wonder why nobody built anything of note in South Africa. Could it have been the all the sanctions ?