Similarly for egg donations, there doesn't seem to be any correlation between the quantity and quality of the eggs being "donated" and the compensation that is paid.  Here are excerpts from two centers about their compensation or rewards for donors [emphasis added] -

Egg donor compensation

Along with the appreciation and gratitude from your recipients, our egg donors are given a financial compensation for fulfilling their donor responsibilities. The egg donation pay ranges from $7,500 and up. First time donors begin at $7,500 with increased compensation for subsequent cycles. The egg donation compensation rewards you for your time, effort, and dedication.

When are Egg Donors Compensated?

Egg donor payments are broken into two disbursements. The first payment made to an egg donor is $750 and is paid upon the start of injectable medications. The balance of an egg donor’s compensation is paid after the completion of the egg retrieval procedure regardless of the number of eggs retrieved.