Personally I dont see that as pay to win at all, because it's a benefit applied to their community as a whole in a PvE game.
It would be another thing cementing them as some of the leading players of the game.
Keep in mind that Grummz had mentioned concierge not being all about money.
It would be cool if the concierge rewards had a more outwards effect from the concierge members, such as being the leader of a guild providing downward benefits to your members, like increased resource gains from activities.