Nostalgia is a funny thing; it often lets us remember only the good and forget the bad. We look back with rose-colored glasses on the past, thinking how awesome it was. In real life, people hang on to odd souvenirs as memory triggers, and sometimes it is the same in game. There are old drops that took us a long time to get or signified a first kill of a boss in a previous expansion, things we just cannot seem to vendor or throw away because it feels like cheating on the memory. So we hold on to these items, allowing them to clog up bank slots so that whenever we go digging through them for an obscure item we currently need, we get that pleasant flashback.
For the longest time, I was a borderline hoarder of nostalgic items. I had my full Stormrage set in the bank from vanilla, my tier 6 and my SSC trash staff from BC, and a few other random pieces, even including a Wildheart helm. I used them to not only remember the old raids and guilds, but friends who left WoW or switched factions or servers. However, it would be a quick, wistful moment -- then I would grab whatever I needed and close my bank back up.
The trouble was, the amount of items and the randomness in which they were fit into my bank created chaos, and as I was collecting tabards for my 25 tabard achievement and gear sets for achievements, I simply ran out of room. So I purged my bank, selling any and everything with a cash value. It was a little tough, but I moved on.
Do you have items in your bank purely for nostalgic reasons? If so, what items did you keep and why? Have you ever had to purge your bank when it began to fill up?