Well, if you're making an iPhone app or Mac app, then it's obvious. But I assume you meant specifically in the case of specifically non-Apple stuff... because

Well, if you're making an iPhone app or Mac app, then it's obvious. But I assume you meant specifically in the case of specifically non-Apple stuff... because they look better to more people (or at least most of us learned to buy into that perception), and represent to many a more "premium" experience. I've seen it on TV ads for years now -- blank-labeled Macbook Pros say "sexy".