It would be nice to have a "proficiency" bonus boost from the quest. Let's say you finished all 10 quests from the blacksmith, so then your blacksmith skill has a boost. Could really help late game
There are very few sources of idle gold. Setting an adventurer to odd jobs will add some idle gold, as well as improving your guild hall. But the vast majority of your gold will come from dungeon runs.
Just like irl fishing!