I sincerely hope that ArenaNet is not using the Risen identifier as a means to cause movement, because such an arbitrary decision (in my opinion) hurts the setting.
That being said, there are plenty of reasons to leave Orr:
1. Zone completion achievement.
2. Traveling to and from Dungeons.
3. Assisting guildies/friends.
4. Farming crafting materials.
5. Jumping Puzzles.
6. Completing the zone quest chain if you missed it the first go around.
7. Killing Champions that you didn’t get around to the first time.
8. Karma Vendors.
It’s simple. “Kill Variety” implies that you have to kill various types of monsters. In name, in ability, and in difficulty there is a HUGE variety of monsters in Orr. Spellcasters, beasts, warriors, giants, fish, etc. all looped into one monster type as “Risen” makes no sense. It is either a glitch in the system or an arbitrary measure to ensure that level 80 characters don’t stay in a level 80 zone.
PS- Counciler.7438 you made your point, you disagree. Quit trolling the thread. You believe that all Risen are the same monster, the rest of us believe that monsters being Risen shouldn’t isolate them to one variety of mob.