Yes, there should be a fixed minimum sum for donors. Donors could be inspired by high returns from this option without thinking about the sincerity and sensitivity of work. Donors should be mentally strong enough to understand their role in entire process and secrecy, which they need to maintain. It has become a money making business, so fixing the amount would make the process more transparent and prevent the agencies providing the donors from become more and more greedy. This will also prevent exploitation of poor women, who do this just for feeding their family.