The high end Macs have always been called into question dating back to the MacII fx. They exist for a few reasons; I suspect Apple use them, companies that use high end equipment use them and they are good PR for the lower end Macs. Back in the 1990s when a Mac II fx, tricked out, was $12,000 most people just laughed, especially so called experts in the media. My company put them into printing companies and newspapers in droves. In those places the cost of the Mac was low compared to other equipment they used, and the ROI was huge.