Well, everyone's situation is different.
As a single parent, I support myself and my kid.
In the past, I supported my EX too.
If she was working, she had her own pocket money, but it never crossed her mind to contribute to the household or her children.
I suppose that's what I'm getting at: a lot of guys say their wife supports herself, but really they mean she just earns her own pocket money and wouldn't be responsible enough to pay some bills or rent.