• You can't use perks to gain ingame money - this forbids things like selling the skulls earned from /skulls, selling item renames, etc. This is to avoid making cosmetic perks P2W.
• You can't use your perk to give everyone access. We don't mind giving your friend a few skulls from /skulls, however offering it as a service to the entire server will result in restrictions.
• Perks shouldn't be used to provide any competitive advantage - EG /cosmetics morphs with flight shouldn't be used to provide infinite flight, it's just intended as a silly gimmick.