Your ROI will go way down when you get sued for breaking the law. There are also much better ways to target your ads (in ways that directly relate) to improve y

Your ROI will go way down when you get sued for breaking the law. There are also much better ways to target your ads (in ways that directly relate) to improve your ROI (like advertising on StackOverflow or HN). The negligible ROI improvements you get by discriminating are not worth the costs to society.