Um, they buy MacBooks.
Then MOD them.
Duh.
Why must people post ridiculous questions without even TRYING to think about them for half a second?
I don't think that's a dumb question... I was also thinking the same thing... I understand that companies make 3rd party stand alone hardware and parts for macs (ie intel motherboards, processors, ram, etc)... but I can't recall when another company branded their own machine using a mac and osx... other than the clones that were out back in the day.