Chen Guan had quite a few pets and Secret Cores on him, mostly Yellow Springs Ghost Soldiers, along with Soul-Catching Scorpions and Red Night Demons, which were pretty much useless.
The prices Chen Guan set weren't high, a little below the normal rate, but actually not by much, yet sales were quite good.
After a while, a female cultivator finally came over, glanced at the sign's content, then looked at Chen Guan and asked, "Boss, how much are you buying Flower Demons for?"
"20." Chen Guan directly quoted his purchasing price.
This world is just that realistic. In the pet market, some dog breeds with good pedigree can sell for millions, while no one would want a stray dog even for 10 or 20 bucks.
Similarly, for First Awakening-level Secret Spirit Pets, it's normal for some with unparalleled quality to sell for tens or hundreds of thousands, but for pets like Flower Demons, no one would want them even for a few bucks.