Bunker Hill paid raiders protection money (tribute). I wish we could seek tribute from the other enabled Conqueror factions. The mechanic could go something like what follows: After detecting a rival faction (outpost or one of its vassal settlements), you have an option to interact with the rival (leader) (either directly or indirectly through a messenger). The rival uses your charisma and a threat calculation to determine whether to accept (pay off) or reject (go to war). In pure Conqueror gameplay, it'd be an escalation option. It could also be used against you after they scout your outpost/settlements. In Liberator, it'd be a way to subsidize your nice guy efforts and/or navigate in the grey space.