Maggie Eastman considers it the worst decision she ever made. In 2003, beset by $30,000 in tuition debt and imbued with a burst of altruism, Eastman, a college senior, decided to donate her eggs to help an infertile couple have a baby. Over the next decade she donated nine more times, earning a total of about $20,000 — money that helped Eastman and her then-husband buy a house.