Apples require proprietary hardware for the mostpart, though it's not as bad as it used to be. Nowadays, you can pick up a Mac and install your own memory and a new CPU... and even have a wider GPU selection. But, Apple still doesn't offer up the motherboards to system builders, and likely never will. Apple overprices everything as is, and all of their systems sell well. There is no reason for them to open up their hardware like that.
It would be nice, but I can't see it happening soon. Even if it did happen, the markup would likely outweigh the benefit.
It would be nice, but I can't see it happening soon. Even if it did happen, the markup would likely outweigh the benefit.