Penance pet is one of the coolest and rarest pets in the game (OSRS). It should definitely be much rarer than killing 40 people in the wild. I believe the pet should be made to only be from Pet Mboxes to show off or by some other method. If want a pet in pet shop why not have a cheaper "pet box" with the wilderness bosses since it's wilderness related? Penance pet definitely has nothing to do with wilderness or pking anyways, no idea how it fits in there.