Also the Adventure Guild do not restrict anyone joining them as long as they follow the rules.
The B and T Association is rapidly growing because of the Sanctuary which is under the jurisdiction of the Adventure Guild.
As of now the monsters that was bought was released into the Sanctuary causing their population to grow and some species were actually evolving naturally inside which is considered somwhat miraculous as monsters rarely evolves.
Of course the reason for this is the rich elements that Hentai continuously gathered and refine in the Sanctuary.
The evolution of the monsters in the Sanctuary is further hastened by the fact that high grade meat such as orcs and griffons were thrown inside.
There is also another reason for the evolution of the monsters in the Sanctuary and that is the Blood Berries scattered all around the place.