The reason it is in place is because we can be held liable for such material posted on the forum. As Scu has pointed out we've already seen it happen...
Today the Rules page has been revamped to clarify what is and not allowed on a global level. Some additions were made that were previously not there...
The hardware that the Macbook comes with is worth the complete price that they come with, if you were to buy them 1 by 1 then you'd be looking to pay...