at least with manufacturing it's easier to obtain loans b/c you have physical assets as security. For software or services startups, it's a lot harder and VC is often the only option. The problem with that though, imho is that SA doesn't really have the scale to support the ecosystem. Sure there are the few exceptions for companies that manage to grow overseas but that is even harder to achieve.
On a side note, i think also one of the underlying problems is that many (esp young) entrepreneurs aren't that business savvy and think that raising money is the same as cashing in. No kids, that's just the part where you double up on blood, sweat and tears, if you're lucky, the money comes later.