DeletedUser
Wow! I really like this idea and I have something to add onto it. If there is going to be a time limit on getting the required items, then the luck of those jobs should also be increased, thus making the items relatively easier to get. If the luck cannot be increased, then simply increase the time limit to say two or three weeks. I'd say up to a maximum of one month to complete the merchant quest. And also, the price of such products should be increased, even if it is only very slightly. If not, then increase the reward. It all depends on how difficult the job/quest is.
There's no time limit on other quests, why would there be one on this? And why would it affect luck? The whole point of the suggestion is to use these mini quests to get people to do jobs that no one does. The quests alone are supposed to do that. Increasing luck is not necessary to motivate people to do the jobs, that's what the quests are for.
There's also no logical reason for luck to be altered in any way. Why would doing a quest change the likelihood of finding items or the quality of items found?