Some experts have referred to the ethical issues raised by paid egg sharing, as they consider it compromises the autonomy of patients to make free choices. If they are told they will have a discount or free treatment in exchange for the woman's eggs, they may choose this option even if they do not want to because of being paid.
Also, critics argue that it involves an indirect form of "egg selling", which related to commodification of human life. This is because women undergoing IVF have already accepted the added time and inconveniences associated with the process. So, it could be argued that the reduction in their IVF costs is a way of payment.
Suggested for you: What is Egg Sharing in IVF? – Process Step by Step.