I just made a bunch of Icebane and Glacial gear for my main team, for the Tyrannus fight. Now I need to gem and enchant it, and suddenly I actually have something I need to spend money on.

Once Tyrannus is on farm, I will have nothing to buy but a hilt, I guess. I'm probably not going to have a chance to raid before Cataclysm (Lightbringer loves its Gearscore, and heroics apparently don't cut it), so buying the thing for a DPS or three makes total sense.