Client-sided GC Saluting by NPCs?

[kamenkuro]

All you did was prove that the system for it is already in the game, they just need to wire more characters to share that logic. Preferably outside of housing, a part of the game many people still don't have access to

What they have will most likely be as far as they go in that regard. And everyone has access to housing areas. Apartments are plentiful, free companies houses, and there are still houses on moderately populated servers. They already acknowledge your rank with random npc's outside as well. If you do any quests with members of your grand company they will mention your rank.