I just sell stuff I don't like / don't plan to use, 50% is better then 0%.
For instance I often bought new armour sets with different gauntlets/etc/etc to see whether I like to look or no, and if I didn't like the look I'd just sell it. Bought all crossbows to determine which one I like most (except hunting/light), sold the ones I didn't like, etc. Why hoard stuff I don't intend to use?