by Exodus » Sat May 04, 2013 3:07 pm
Hey Bartuc,
My best guess would be because you can pretty quickly tame a lvl 30 cu with few fails considering you can take taming well over 120 with jewelry. There's better custom pets out there that have things like poison immunity and the ability to poison others. Also, if the Cu self healed, then that would take the fun out of a human bio pet doing it!