So what are these "benefits" that you speak of?
And being damaged goods is certainly undesirable but it's certainly not the death knell it was in years past. Single mothers of today won't have too much trouble finding a simp to take care of them and their 4 kids nowadays.
The benefits are different for everyone depending on the woman. My husband has someone to cook for him, keep his house clean, buy his clothes (and clean them), deal with his mother when he doesn't want to, someone to talk to when needed, he doesn't have to worry about another man raising his children (unless it's his fault), and he has someone that will always be there for him and be faithful to him.
Would you date a single mom? Would any of your friends or family members date one?
What makes a woman the 'right woman' for marriage?
A woman that isn't materialistic, knows how to cook, is clean, takes care of herself (and you), shows good parenting qualities, isn't selfish, respects you and herself, and has a desirable personality/character. Of course the right woman would depend on what you want but I'm sure a lot of men find those qualities desirable and would agree that a woman that shows them is a good woman.