The Guild of Artificers took their tale of the dungeon, the beholder, the three tragically dead heroes, and the wand’s creator and packaged into a story. A week later, they sold it to a most discerning collector for 40K gold.
Let’s assume for a moment the Old Man is not an altruistic lover of villagers and hater of all goblinkind. Nor is he sitting in the same Inn with the same offer of 4000 gold pieces waiting for the level-correct Murder Hobos to wander in for his health. What’s in the side quest business for the Old Man?