Reminds me of this theory; there is only one female on earth capable of giving birth(there is a TV series about it as well) could you imagine the worth and importance of that lady? she's indeed priceless
The reverse case would be more demonstrative
I mean with just one male remaining. What's the purpose of that female if she could only give birth to a dozen of children all of them could be boys (and she could die in the process)? While with just one man, given today's technologies (e.g. in vitro fertilisation), it is possible to fertilize many thousands of women. And that would really work out