That number would be dramatically higher in scenarios where men had desirable women basically throwing themselves at them, which is the case for the extremely wealthy. This somehow reminds me of the Churchill joke:

    Churchill: Madam, would you sleep with me for $1 million?
    Woman: Why Winston, yes I would.
    Churchill: How about $10?
    Woman: What sort of woman do you think I am?
    Churchill: We've already established that. Now we're just negotiating the price.

And I think this is all a logical consequence of evolution, which is driven solely by fertility. A woman can only carry one child at a time and so it makes sense for them to seek a highly qualified/'resourceful' partner to have the most chance of her genes being successfully carried forward, whereas a man can theoretically father hundreds of children in a single year, so it makes sense for him to be more 'driven.'