In the UK, as I said, they're desperate. IVF is a usably reliable technology, but the fact that it's the business of selling hope means that financial parasites have flocked to it, and that's led to heavy regulation ... heavy enough to put donors off. And payment is legally restricted to actual expenses, to a not very big upper limit. So the requirement is pretty much "don't have HIV or known genetic disorders."

So what I said above applies if you're in the UK. Get donating!