And Apple doesn't care at all about CUDA. None of their software uses it, and it's not even bundled with OS X. It's a third party install.
Not to mention, Apple's not going to use cards that put their own software at a disadvantage because of low OpenCL performance.
Their own software (which i only could think of ) is finalcut? What about the other tons of big players who use OpcenCL and Cuda?
Nvidia "low" opencl performance? i have seen a lot of benchmarks from all kind of programs, where Nvidia cards score quite similar and in some cases even outperform in OpenCL. The performance statement is not a verry strong one and a reason to defend the ATI only option.