When buying a position in a Mercenary Guild, the mercenaries didn't purchase strength and backing, but connections and reach.
Mercenary Guilds were a gathering of selfish mercenaries that only thought about their selves, the only people who probably thought about the Guild were the Elders, and the Guild Master.
Roy had no intention of caring about the Guild. To him joining this guild was just a way to earn himself an identity and cover for the future.
Depending on the tiers one would have access to greater intelligence information or other services provided from the guild.
Meaning that for someone like him who was currently clueless about the planet Navita, the Guild was like his library.
As long as he had enough mana stones, he was sure that he could even buy information on the color of his Grandfathers underwear.