I've been clearing maps and getting a lot of drops, some equipment stronger than the one I already have, thus switching my equipment to get better. Sometimes, I get drops which I can 'sell as junk' at the merchant or put in my Bank as materials.
There are some items left. I always sell them at the merchant, but sometimes I wonder which items would make more profit in the Black Lion Trading Company. Which items should I sell there? For example wands, do they have certain attributes which are worth money? What should I look for?