I was doing some trading recently. While I'm happy with the Merchant's Guild and the current system we have, it can get a little repetitive and boring. I was thinking there might be an easy solution - have the clerks offer trade quests. It wouldn't have to be anything elaborate, just enough to add more variety and challenge.
As an example, I was thinking periodically clerks might ask guild members to perform special tasks: deliver trade goods to a specific individual instead of a guild outpost, bring trade goods that the outpost doesn't normally accept, bring spell components or crafting materials (like ore or shards) for special customers, that sort of thing.
The monetary rewards that trading gives seems to be well balanced already, so any trade quest awards should be along the same lines. It would be nice if you could track your reputation as a trader as well, or even compare it with other characters who are Guild members.