Two points immediately spring to mind.
A) As Isengard pointed out, games have weathered inflationary trends over the past ten years exceptionally well. I remember buying Carmagedon and Theme Hostpital for R300 each, that was ten years ago. Compared to pretty much everything else, such as CDs, food, electronics, cars, property etc, games have remained quite cheap IMO. In fact, I would say that they are cheaper now relative to everything else than they were ten years ago.
B) Games these days are far more expensive to develop than they ever have been. Development teams are bigger, and the tech being used is more expensive. Developers actually need to charge more to maintain their profits.
In summary, I really dont think that PC game pricing is a problem. If you do find games bit heavy on the wallet then buy carfully. The best thing to do if you are in such a situation is wait unti games come down to the R200 mark.