I know of a large family in which the mother kept "trying for a boy" after a string of girls. She finally got her boy. She treated him poorly. Now he has deliberately turned his back on her and is out of contact with the family except through e-mail (and the mother refuses to get an e-mail address).
My guess is these one boy families probably raise a very spoiled child.
This article raised a thought that I had not considered before. If there are not enough women for the men, that means the men must import a bride or many will go without marrying. That much is obvious.
But that must mean that those who have a boy are reducing their chance of passing on their genetics - what if their son never finds a bride? While those who have girls will actually be the more successful family, because the odds are increased that SHE will be able to find a husband easily.
So the more enlightened (or whatever reason responsible for sparing the girl child) family will reproduce, while the ones killing their girls may never carry on.
In essence, the family with the girl is actually breeding success, opposite the intentions of the family.