Actually I think it is justified. Otherwise folks would just swap their retainers jobs all the time to farm specific things like minions. They were meant to be rare and you should have to work towards them. Otherwise there is no "accomplishment" involved. Just another "I wanna be lazy hand me everything on a silver platter" like a lot of things. (If that happens we might as well just add every new minion to the mog station and call it a day...)