Aside from developers, designers, technical writers, and (one hopes) a usability girl or two, Apple's got a poet on staff:
There once was a user that whined his existing OS was so blind he'd do better to pirate an OS that ran great but found his hardware declined.
One thing that Apple has a fundamental understanding of is building hardware and software that's authentic. They don't try to always be ultra-professional, because they know that ultra-professional comes across as ultra-stuffy. So Apple puts in little touches like this, and people feel like Apple is more real when they find it. It doesn't take away from the polish that Apple puts into their products, it just makes them a bit easier to love.
This is a lesson that many companies need to learn. People want to know that there's really someone behind the curtain. Easter eggs and little hidden messages like this make people smile. It makes your users feel more connected to what they're using. How is that not a good thing?