2. Charity listings while also being eager to get rid of the respective item.
Selling an item to a NPC vendor essentially deletes said item from the game, and sometimes I'd rather take a loss and see if I can sell common items to anyone who may need them.

On that note, Buying vendor distributed items en masse to resell for profit is generally ineffective.
You may get lucky and profit off of ignorant players who don't read vendor prices, but odds are you'll just end up trying to rid yourself of items you don't want or need.