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(...)one key difference is that you don't run Mac OS X as a server operating system or on the cloud.

It's actually a pretty decent server environment.

Am I missing something or does this only run on apple hardware, yet apple don't make any server hardware?

They used to; nowadays you're apparently supposed to rackmount Mac Pros:

That's a valid point, but you cannot elastically provision 100 OS X servers machines on demand in the cloud.

I don't think anyone has tried it, but is there a reason why it couldn't be done?