Apple need not set the end price exactly. It's about the ratio. If the local distributor adds a % to the 'wholesale' price they pay the ratio will work through to the retail price. The price ratio between the different models should therefore be the same for 'wholesale' and retail here and in the US. My gripe is about this huge price ratio difference between 8GB, 16GB and 32GB models (more than it should be considering the prices of flash memory). This ratio must start at the manufacturer (Apple).
The difference is $70 for 8 - 16 and $100 for 16 - 32 in the US vs R1000 and R1500 from core. Apple undoubtedly make a handsome margin but the pure cost of the flash memory is not the only thing to consider.
By the way where does that R300 cost of flash memory come from? For interests sake.