Even if I win and you let me go, you don’t know that I wouldn’t tell everyone about your “game.” You wouldn’t be able to hunt here anymore, and no government would let you hunt for humans in such a fashion.
I could be just as boring as any dumb sailor that washes up on your shores. What entertainment would I be for you then?
It was your family that led you to the enjoyment of life that you have now. You wouldn't want to hurt them after that. Imagine how devastated my family would be if they learned that I died.