The reason a sperm sample is 13 dollars and a woman surrogate costs 20k has nothing to do with the value of the sexes. Men can pump out sperm like 3-4 times a day and a baby takes 9 months to birth and requires maintenance to bring to term. Not to mention youre paying someone to get knocked up with someone elses child, whereas a man is just jerking off in a cup and then he can wash his hands of it and go on his way. A man can impregnate 20 women in a week but women can only get pregnant 1 at a time. It’s supply and demand.