I said to her, "You shall stay with me many days. You shall not play the prostitute, and you shall not be with any other man. I will also be so toward you."
Now the normal price of a slave was thirty pieces of silver. So this fifteen pieces of silver indicates how completely destitute she had become, probably sick, anemic and all through her wasted life; lost her beauty, lost her desirability. He was able to purchase her for half the price of a slave, fifteen pieces of silver.