"Raising daughters is not a good business deal. You make a twenty-year investment and then just up and give the whole thing away to an inexperienced boy who doesn’t at all appreciate the value of what he is getting"
Plus you can never get into the bathroom, or use the phone in the evening, again. You also get to watch them amaze you time and again until you are sure that they will win a Nobel prize one day, only for them to come home in tears because their best friend said Kevin from the Jonas Brothers was better looking than "Troy" off High School Musical.
And when they are older and curvy in ways you don't like to think about, you will still think of them as "your little girl", the moppet who loved it when you made sandcastles after sandcastle for her to squash. Then when "moppet" disappears for a night with her girlfriends in a halter top, a thong and a skirt narrower than many belts, your heart will break with the slam of the front-door.
Nope, daughters are not a good business deal. Nor are they meant to be.
It takes someone steeped in the Old Testement vinegar of "take my two daughters and do what you like with them" (Genesis 19:8), and "sell your daughter as a servant" (Exodus 21:7), or "a son makes a woman unclean for 33 days, a daughter for 66" (Lev 12:1-5), and "dishonored daughters of priests should be burned to death" (Lev 21:9) to be vile enough to think that way.