With research times lasting months of real time, players are often looking to maximize their trait research times and will often gladly pay for certain traits on items. Some can be quite difficult to find and getting 500g-1,000g for selling a simple level 1 item with the required trait is very common. You can pay attention to zone chats and you’ll frequently see players purchasing traits, so if you have them be sure to contact them as this is one of the easiest ways to make gold with very little effort.
You can also utilize guild stores to sell traits, though from my experiences not as many people are searching there. Some of the most sought after ESO traits are:
1.Light and medium armor: Impenetrable on gloves, head, shoulders, belt
2.Heavy armor: Divines and Infused on boots (and pretty much all other item slots)
3.Staves: Weighted on Inferno Staff, Precise on Lightning Staff
Also Training and Exploration are surprisingly sought after frequently as well for all items: most players research these last and with 12/24 day research timers are easily prepared to pay 1,000g just to do it as soon as possible. This is by no means an extensive list of traits you can sell, but guild stores have limited slots for putting items up for sale so don’t overdo it and keep it down to just a few best-selling traits.