I think it would be great if the daily missions from the bar could be downgraded in difficulty if the player does not want to complete the mission. The idea would comprise of a "I want an easier mission" option from the barman. When selected, the barman would give the player an easier mission than the one they currently have and reduce the reward from the mission.
I think this would help players that are having trouble completing missions due to level of the mobs or difficulty with PVP. Some of us just want to get these missions complete, even if the reward is lessened!