I'm not sure I follow your logic. If people won't even level crafting to repair their own gear, why would they do it to repair someone else's gear.

I would like this to be a feature though, as a way for me as a crafter to make money. Allow the lazy players to click on me and have all the functionality of a repair npc, but the gil goes to me instead of an npc. If it works in dungeons too that would be great