2. Making money from selling eggs is hardly a donation. Profiting from this is wrong.
3. Eggs donated are used to create embryos that will either
A. become healthy and mature - your child.Profiting from the egg market is wrong only because of the inherent dignity of humanity that is grounded in the image of God. And if not for God, if not for truth, we wouldn't need to be bothered by the health risks associated with the scramble for eggs. No serious reason to care.
B. Die because the procedure didn't "take" - your child
C. Are asexually "tricked" to become real embryos for destructive research purposes - your child
If this is really all there is, then there is no reason to care about anyone else....but because this isn't all there is, because God exists, we do care about the well-being of others.
Unfertilized eggs may not be people, but the intent is not for them to remain in the unfertilized state. They are intended to become life, i.e. people, either for purposes of embryo-destructive research or for assisting the infertile in having children. But it is because of the sanctity of all human life, no matter the age or the stage, that provides the basis for wanting to avoid risking women's health and viewing the profit from eggs sales as unethical.