There isn't an equal resolution to this dilemma. It's an inherently unequal process: Ejaculating doesn't carry any permanent health risks. Pregnancy does.
Suppose the father could provide so much money to the mother that she could afford the finest medical care, plus expenses for time and trouble, and then raise the child himself so that the woman never has to put forth an erg of effort ever again. So what additional amount of money is equal to the time and trouble of a woman having to wear Poise pads for the rest of her life, because she got a massive vaginal fistula from a botched episiotomy? Or having to explain to her family and friends that she didn't want to be the way she was those past few months (knowing that a good chunk of people think depression isn't real and won't believe her), lose her job due to the length of treatment (taking a hit to lifetime earning potential), and then come up with an answer in job interviews for why she lost her last job and wasn't working those months, all because of postpartum depression? If she's comatose or dead from eclampsia, how much money (and paid to whom) fixes that?
Not all medical problems are fixable or reversible. To theorize that there's an amount of money that's "enough" to force a person to take significant and permanent medical risk -- to buy a person's body -- is to deny personhood, regardless of the perceived value of the result.
This is why drug companies don't offer you $10,000 to take either their pill or a sugar pill for a week. Once you offer enough money, everyone will say yes regardless of the risks, and the international medical community has agreed that this is an unethical thing to do.
Now suppose we're in a magical universe and there are spells that completely cancel out ALL the inconveniences of pregnancy and the healers at St. Mungo's can completely prevent or repair ALL the potential medical problems. Does this then force the debate over to the relative value of the pregnancy?
(Interesting that when I'm reading this thread, my ads turn to: Michele Bachmann; baby name websites; pictures of cute children playing on Stainmaster brand carpets; weight loss scams.)