I had read on the internet (so it must be true) that it's actually very difficult to achieve such a blunt profile on a rim- the spokes tend to pull through very easily.
Hence the Chinese factories make theirs a little less blunt than Zipp and HED so as to avoid having to use the same manufacturing process as them, with (presumably) approximately the same sort of costs.
I had read on the internet (so it must be true) that it's actually very difficult to achieve such a blunt profile on a rim- the spokes tend to pull through very easily.
Hence the Chinese factories make theirs a little less blunt than Zipp and HED so as to avoid having to use the same manufacturing process as them, with (presumably) approximately the same sort of costs.