Most players have huge amount of weapon/armor trait material and green/blue improvement material. It can't be used and can't really be sold either as everyone has the same problem. I feel bad dumping them to bin or AI merchants. There would be easy solution:
Weapon/armor trait material:
- Remove "No trait" option, so each armor and weapon needs one stone. This would cause plenty of demand for useless stones as crafters would finally need them for leveling and writs.
Green/Blue improvement materials:
- 8:1 conversion to better material either with alchemy/magicka/AI cleck, which every would suit the game best. So if you got 64 greens, you can turn them to 8 blue and then again to one purple.
- Improving weapons/armor with price increase trait should increase the price dramatically. So you could use your extra tannings to weapons/armor you collect. Lower the value of white weapons first and then 50% extra value for each level you improve them.