To put that in perspective: R650 is a basic grocery shop for my small family for a week.
I have a day job, a baby under a year old, another kid reaching teenagerdom and a bootstrapped startup. My wife works part time.
I wish more startups and even more mature companies would build in some sort of currency sensitive sliding scale for their pricing models. I know what a ball ache pricing is and how much time we tend to spend on it already but I'd love to be able to support and often times the reality is that I simply cannot afford to... Because of the exchange rate.
I take issue with your suggestion that people like myself piss off and use OSS though and I take issue with it for one simple reason: I personally use the 'nag screen version' of Sublime. I'm crazy about the product and when I have a row of developers working on a product that's paying the bills then rest assured - I'll be buying those licenses. In the mean time people see me using it, I evangelize the app fairly regularly, etc.
I know the Sublime guys are trying to earn a living, we all are, and I think that having more users of any kind will ultimately lead to more users of the paying kind.