Last year, a 47-year-old California woman named Melissa Cook decided to become a commercial surrogate. Cook is a mother of four, including a set of triplets, and had served as a surrogate once before, delivering a baby for a couple in 2013. According to her lawyer, Harold Cassidy, sheâ??d found it to be a rewarding way to supplement the salary she earned at her office job. â??Like other women in this situation, she was motivated by two things: One, it was a good thing to do for people, and two, she needed some money,â? Cassidy says.