"They have their own children, they've finished building their families," she said, calling people who oppose surrogacy "ignorant."
"They should come here to meet parents who dream of having a child. How can they deny them this right?"
Marcia, a 40-year-old Brazilian who lives in Luxembourg, is one such case.
After trying for three years, Marcia has just arrived with her husband in New Delhi to sign a contract with the clinic.
"When I look at the photographs of all these babies in the waiting room, I want to cry," she told AFP, refusing to reveal her full name because she has not told her family about her step.
"I'd rather not meet the surrogate mother who is chosen -- especially since it is not certain the pregnancy will be successful. We've already had so much disappointment."
She said she will initially attempt to have her own embryos transferred into the womb of the surrogate mother but if that fails, she will opt for an "egg donation."
"At first it was difficult to get used to the idea of another woman carrying my child, but if this is the only solution, then we will have a baby this way -- it's like a miracle," Marcia said.