Macs are still strong in publishing; I worked for Time Warner for a year as a production and systems geek (back in the days of 6100s and system 7.5.x.. I remember Quark crashing 15 times an hour as enough to make an award-winning and highly talented art director cry).
Similar idea, if you look closely at any number of website ads in print, you'll notice that the screenshot (Mac) doesn't match with the stock art photo of the computer (almost always a PC).
-pwc