Hm, Staphylococcus normally live in the human body, mostly in the skin - no wander they can never be completely destroyed by antibiotics. You cannot destroy what is natural part of your body - this bacterias are problem only when they are out of control - mostly caused by damaged immune system.
Every use of antibiotics lowers natural immune system, so body more easily develops new infections, ( due to the damaged immune system), while in the meantime has become resistant on antibiotics. In many cases, people die on that way, not because of Staphyloccoccus, but because damaged immune system cannot help fighting the excess of them.
Shark skeen for healing human skin problems? Let us think logically: since we do not live in the sea water,we cannot need same type of protection sharks have. It seems that developing such product will cause much more harm to the sharks, then to save any human life.