The dowry does not reflect the value of a woman, but rather an honoring to her. Islam has made this dowry a gift that is given to her as a way of expressing the feelings of love between a man and a woman.

فَكُلُوهُ هَنِيئًا مَّرِيئًا {then take it in satisfaction and ease.}: if the woman gives up, willingly, to you anything of the dowry, then you may take it with satisfaction. You presented this dowry as a gift and honor to the woman and not as a price of her, the woman is priceless, for the human being is honored by Allah (swt):

وَلَقَدْ كَرَّمْنَا بَنِي آدَمَ

{And We have certainly honored the children of Adam} (Al-Isra: 70)