The days of attempting to play PC-only titles in a virtual machine are (thankfully) starting to be a thing of the past. Despite that, the world of non-console gaming doesn't quite reflect this change yet, as evidenced by the fact that the term 'PC gaming' is still generally the preferred nomenclature without actually applying to the OS X. And while these disciplines still account for a large portion of Mac people, Apple has gained quite a good deal more of the personal computer market share in recent years. It used to be that Mac users were a relatively small group, mostly composed of A/V nerds and graphic designers.
