Is it the sexual nature? When the manga opened up it, it described Haru as being a slut who slept with other animals, even one of the main characters. She even felt up Legosi's junk and tried to go down on him. While the manga shows nothing graphic, it's still shows the base sexual desire for all living things on some level. It gets worse in later chapters (but still nothing graphic)
Or is it just how crude the buyer was? Again, that's how the Black Alley Market does things. The point is to show that those without morals or ethics are willing to buy whatever for their selfish needs. Gotta remember a known gangster organization was overseeing the process, so that should also tell you just how deep that abyss goes. The BAM is heaven for those with black hearts and hell for everyone else. You just got a taste of how the black market does things in an anthropomorphic version is all...