Access to guild armory.
You can learn the guild special ability.
A signet ring with the organization crest.
A network of safe houses to hide in.
Light weight field rations.
Access to a custom poison only known to the guild.
Access to well paying jobs.
Missions that give generous experience.
Special training that will be paid for by the guild.
A legendary weapon handed down from guildmaster to guildmaster (you only get it if you become guildmaster).
Access to a list of Teleportation Circles.
Access to portfolios on certain individuals.
Access to a transportation network.
Captains get a magic item the guild knows how to make.
A means to Teleport to the organization headquarters.
Access to a guild store.
Uniforms based on rank within the guild.
Identifying tattoos of increased complexity based on rank.