Quote 40
WALTER
You are in it – Don’t you get up and go work in somebody’s kitchen for the last three years to help put clothes on her back? (1.1.120)
Walter wants to make Beneatha feel bad for benefiting from Ruth's hard work. However, Ruth doesn't seem to begrudge making the sacrifice for her sister-in-law.
Quote 41
WALTER (Crossing slowly to his bedroom door and finally turning there and speaking measuredly)
What you need me to say you done right for? You the head of this family. You run our lives like you want to. It was your money and you did what you wanted with it. So what you need for me to say it was all right for? (Bitterly, to hurt her as deeply as he knows is possible) So you butchered up a dream of mine – you – who always talking ‘bout your children’s dreams… (2.1.187)
Walter's ego is too big to consider sacrificing his liquor store dream for the betterment of his family.