In the medium size city like No.543, there was no place for the weak or common public because almost all the medium size cites were located in dangerous areas like the Vile Witch Valley.
The denizens of medium size were 70% epic rank. They were mostly adventurers and part of one of the three hegemonies. While 30% were extraordinary rank beings, who were mostly of the working class in the city.
Furthermore, the members of the Alliance and Mercenary Agency did not live far from danger like the alchemists. They form their own teams or parties and then hunt around the Vile Witch Valley to earn money and then spend that money to access training facilities provided by the two hegemonies to grow even stronger.