"My guess is you'll end up with a bunch of babies nobody wants to adopt."
Your guess is wrong. Try again.
Like I said above, there's a reason couples spend tens of thousands of dollars, and wait years, to get babies from Europe when there are so many available here.
Healthy white babies are in demand. What about those extra black babies produced by the cash incentive? Not to mention a drug addict would gladly turn over (and make more of) a crack or meth baby for cash. Meanwhile, the middle class college student who is having an abortion so as to not interrupt her college career or embarass her parents is less likely to bite.