Fame. This earns you more quests. It also will lower the prices when you buy from NPCs, and raise the price when you sell to NPCs.
It you learn to navigate the cities so you don't get lost
They are fun!
You can check your fame level for each town by speaking to an NPC in/near the town's local eatery (where NPCs hang out to gossip about all of us Adventurers). Here are some repeatable quests and below is the items you will need to complete these quests. I have not listed all the available quests, but some good repeatable quests for fame. If you know of a quest that should be added please let me know and I can add it. Some areas have currently have only a few quests and I would like to add more.
Click on the nations flag for the details of each quest.
