I haven't done much hoarding, started to and sold the majority. Had over 75 of each small gem, but sold them to make room for more weapons, armor, and rings and necklaces. I've got a vault for future crafting items and quest items combined. But right now I'm packing my storage spaces with wearable items that can be used Now. I can bring any one of my resistances up near or over 100, helping me dominate any area im in. And my collection of weapons for me and my companion take up a vault and a half.
I'm eager to see what the crafting skills will be about. But we don't even know what we will and won't need yet. And there might be a difference in the crafting for character classes. I'd hate to pack a vault full of stuff that I can't use later on down the road!... most items, like minotar horns and gems stack up quickly. I'll gather mine as needed!