Everyone was surprised after hearing this revelation. After all, on the surface, the Church of the Fortune Goddess and the Divine Sorcerer don't seem to have any problems with each other.
The Holy Priests should be aware that the Sorcerers like them disdained these Mind Controllers who liked to enslave people without their consent.
Although Sorcerers like them also purchase people from time to time, they were taken by them for the greater good. The people they were taking were willing to be sold or get experimented on by their Sorcery and Alchemy.
They wouldn't buy people who don't want to be bought. In short, they were still retaining their human decency despite their noble status.
They would even follow the laws of the nobles in the territories where they were purchasing humans, as they would always pay their taxes and such.