Because somebody needs to grow your crops, sew your clothes, lay your fiber optic cable, synthesize your medication and cut your hair?
If you want to spawn children under the theory that they can sew my clothes be my guest. I assume you did not mean to confine this benefit to yourself given the other things you lumped it with.
I have no interest in bringing a soul into this world to satisfy anyone's economic interest. If you disagree that's your prerogative. Historically the only thing more dangerous than having kids is trying to control who has kids. So do what you will. Just don't ask I be excited for you to raise children under such a flimsy theory.