When Steve Jobs returned to Apple (with the purchase of NeXT), one of the first things he campaigned for was to kill the Clones. It is difficult to provide Support on a Computer you don't have the specifications for, so it was more expensive to service the Clones than what they were getting from OS Licensing.
(Also, since clones were Be Inc.'s biggest market at the time, and BeOS was the other competitor to NeXTStep, It could be argued that Steve wanted to completely Annihilate Be. Be survived, but that's another story
)
Apple have remained Focused on being a Hardware company ever since. OSX was designed specifically to sell Computers, so It's unlikely to run on anyone else's computers in a hurry. If you want OSX, you need an Apple Mac.
The closest thing to a Clone in todays market would be the
Pegasos Machines, which, can run MacOSX through software Emulation using Mac-on-Linux, but it is definitely
not a Consumer System.