Hold on..it just came to me. You mean the NPC that is at the tail end of the Ul'dah market, on the side of the map where barely anybody goes at all?
...you pick odd things to talk about.
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So instead of just unlocking a job you literally never have to actually use once unlocked, you're prepared to either A.) hope and pray that SE will remove an important quest NPC they will probably never remove or change, or B.) have that quest stay in your current quests list indefinitely by never completing it after initiating it. Seems logical, captain...
Or you could you know. just start the rdm questline and then just never touch it after that. Like I did with lancer and archer :T