Is honestly not old gear or tabards or even cooking. they have given us a lot of solutions for that (and to be fair we are far better off then when we used to have pets in our bags!)

For some reason I have yet to fathom, I keep all of my old holiday gear - you know the pants, boots and shirt that you pay 200 of some holiday item for (be them hearts, tickets, or whatever), put them on, do a handstand in the opposing factions city while whistling the ironforge dwarf digging song backwards for 3 minutes to get an achievement for and never wear them again... Only I keep them in fear that next year I WILL have to wear them again for some new achievement that never comes and I don't want to work for them again.

and can someone please explain why I still keep my

Mallet of Zul'Farrak?
Mark of Honor Hold?

I mean seriously... what's the chance that Spirit Shard's are going to make a currency comeback and provide something useful to me at my current level (I have 32 saved up JUST IN CASE!)?

And yes, there is all the "cute" stuff that I just can't seem to get rid of! Like my
Super Simian Sphere
my Puntable Marmot
and even holiday things like my
Brazier of Dancing Flames
and archaeology items like my
Ancient Amber which I use all the time when hanging around SW.

*Maybe* Blizzard needs to do something about my bag space for some of the mentioned items, but it's clear that I need help as well. I'm an online pack rat! Which is amusing since I keep very little in real life.

I think it comes from the RPG days of old like zork where you never threw anything away because you could combine that leftover piece of magazine paper with the used bullet to make a match and light the oil rag so you would not be eaten by a grue.