The non-father should be a $ 1200 month meal ticket for the kid's mother who happens to be a slut? Want to guess how much of that money is spent on the kid? Find the actual father, make him pay the kid's support, and jail the mother for 90 days for perjuring herself during the divorce proceedings with respect to paternity.
Again, this is a he said she said.. he says she cheated and got pregnant he knew nothing about it.. she says he was infertile an the both found a willing donor to help.
While you may not like it, infertile couples have been having kids by the second argument long before sperm banks existed, and will until there are no longer humans around.
This is a he said, she said.. either one could be lying. This isn't a clear cut case of courts saying DNA is meaningless.. in fact its far from it. The case for that would be when the woman clearly admits to cheating and having a child behind her husbands back... and the court still orders hubby to pay. While these cases may exist, this isn't one of those.
$1200 per month is far more than it costs to raise a child.
I can't imagine spending that kind of money to feed and clothe my kids; even including medical care, unless there are some extremely extenuating circumstances. I'd bet that most of this money is not going to the kid. This business of making the man pay child support for a kid that's not his is wrong. He had nothing to do with this; it's the woman's bad decision, let her live with it.