Why should you farm a low lv instance as a highlevel player anyways?
really Mostly NO ONE is interested.

And i dont enjoy to help players with my lv 50 char for a low level dungeon. the "newbie" receives no exp while clearing it, nor he has any gaming experience "Killing ifrit in 5 secs"

seriously (for me) its more interesting to experience again old content stuff, although i dont have any low level class in that range anymore.