When you purchased a overpriced computer just to play it on max settings.
I haven't done this as of yet. Although, I have recently been drooling over an Alienware model and planning out exactly how I can manage to save enough to buy it so I can run Morrowind, Oblivion and Skyrim and the associated mods on max settings.

Not to mention pricing surround sound speaker systems and good headphones (for those late night can't sleep gotta play times)
I'm also guilty of several of the other postings in this thread.