I know that others have the same sentiments. For instance pictured above is the hat of one of my good friends in game. She's had those moose antlers for about 2 ½ years from Onyxia. I know that she'll never get rid of them, and if she did... well, our guild would probably have to gdisband.
There's something nostalgic about keeping around old gear. It provides a memory of "the good old days" when hitting 60 actually meant something. Those old pieces of gear meant that you had accomplished something epic when epics weren't free. Our old epic pieces of gear are a testament to a time when the game was still new and the wilds of Azeroth were really wild.