PCs are cheaper than Macs. Macs are less expensive to use. A survey from Mac users says so. Chris Foresman in Ars:
A majority of respondents said that Macs cost less in terms of time spent troubleshooting, user training, help desk calls, and system configuration. Admins generally agreed that costs related to software licensing and supporting infrastructure were the same between the two platforms.
While I do not disagree with the results, it seems somewhat disingenuous to tout a survey taken by the Enterprise Desktop Alliance, a decidedly pro-Mac group.