Although it is clear that financial compensations may cause some potential harms which must be addressed and acknowledged, it can be defended on ethical grounds too. For example, it has been proven that providing financial incentives increases the number of donors, which allows more infertile couples to become parents.
Thirdly, it can be said that financial compensation advances the ethical goal of fairness to donors. It should be kept in mind that egg donors have to bear several burdens not only on behalf of recipients, but also related to society in general. Thus, compensation for bearing them could be justified morally.
Suggested for you: How Much Money Can You Get for Donating Eggs?.