How much do I get for my sperm, breast milk or egg?
This is simply between you and the receiver. You agree on a compensation individually. Some donors will do it for free, while others will say “I want 1’000 $”. In most cases, the amount will be somewhere in between, depending on the country, economy and so on. SafeReproduction is not involved in the compensation process at all.
It could also be an option that you agree on a compensation depending on the result. Sometimes you have to try several times until it finally brings the desired result. So compensation after several attempts could be an option. But everything is, as mentioned, just a matter between you and the receiver. In any case, you should be compensated for all your expenses, regardless of the result.
Parents to be usually spend a fortune for UIU, IVF and the like, so the compensation for the donor will not even be the biggest part of their expenses.