1: You will need to set the mission difficulty to the highest level for maximum prestige /xp reward.
2:You will need a level 30+ to complete the mission.
3: A level 20+ to be the one who gets the missions.
4: low level 8-10+ members to tag along (you may have to lacky them)
Here is the trick.
The level 20+ gets the mission and you all head out as normal-
Next- while in the mission the level 30+ member must leave the group--
Have everyone else wait at the beginning of the mission while the level 30 member takes care of the objective.
Even though you will do absolutely nothing, and the level 30 will NOT be in your group.
Everyone else will receive the Mission XP, Infamy, and most of all the Prestige!
With a group of 8 people everyone averaged about 1.4k-2.5k xp 2k infamy and 450 prestige per person.
We made about 36,000 prestige in 30min.
Each mission takes about 3-4 min seeing as how the level 30+ basically decimates everything and anything.
At the end of the mission be sure to re-invite the level 30 so he doesnt have to walk all the wa back to the door
p.s dont know if it still works but about 1,5 months ago it had.