In a harsh world of kill or be killed a decent weapon may be the only thing standing between an adventuring collecting loot or getting a free port back to town. When your blade get's dull, your staff breaks, or better yet you advance in level a new improved weapon is in order.
Keep in mind that weapons are class specific and some classes actually have two options for weapons.
2 Handed Sword
2 Handed Spear
Daggers ( Dual Weapons )