From Dark and Darker Wiki
This wiki states gear gives AP = gold when sold to merchant. Thus a 4 slot purple item would give 40 AP (10 gold/slot for rarity times 4) and it states treasure gives 1 AP per rarity.
People keep saying 1 slot treasures are most efficient for AP gain, but this makes it sound like gear would be better. Can someone PLEASE clarify this as I am getting such drastically contrasting info.