The game needs a more randomize cross zone events, much like the dragon attacks in skyrim. This would encourage and give people reason to get out of orr at level 80.
Also, i think karma, exp, drops, and golds should be scale by the level of your character, not the zone itself. This means if you are level 80, monsters will always drop gold and karma that is around you level.
To counter people farming low levels area all day, add a deminishing return on the drops and exp. the lower level the zone is, the higher and longer the dr will be. This way it will force them go travel from zone to zone to farm, and they can help populate some of the game zones while they are doing that.