Simply put, the greater the demand for those who want to adopt = decreased demand for those who are killed.
I feel that your post makes no sense. You use economic terms mixed with a mathematical equation, but I do not have a clue what you are talking about.
There is a suplus of good people willing to adopt who are heterosexual. Also state mandates for homo adoption force Catholic adoption agencies out of business.
There is already a very high demand for adoptable children. Allowing gays to adopt would just make it more difficult for normal couples to adopt.
In any case you would expose children who have already come from traumatic situations into world of mental illness. With families consisting of a man who pretends to be a woman or a woman who pretends to be a man, these children will have no hope of ever being raised normally.
Then you have the predatory gays who adopt babies to pass around to their friends and molest them. There is nothing about this situation that is beneficial to children. Why would anyone want to subject a child to this.
Only if they can sell them, and so far they can't. They can go to China or Africa like everyone else, I guess.