I have 2 extra retainers and I have to be absolutely brutal on my glams. Anything I haven't used for a month or two gets turned into GC seals (sob), if I can craft it I get rid of it unless it's hard to source materials for, if a dyeable, craftable version shows up I tend to get rid of my other dungeon versions, throw whatever I can into the Armoire, etc.
As for crafting mats, I mostly only keep processed materials now (nuggets/ingots, finished gems, etc). Only raw materials with a LOT of cross-uses (Deepeye tears, say) stay unprocessed. I'm still doing ok, although I've had to offload a lot of HW materials now that they're worthless.