It is important to realise the grim realities of poverty that Walter and Ruth and the rest of the Younger family live under every single day of their lives. It is clear that living in a cockroach infested apartment with mice running around is no fun, as is working as a chauffeur to people richer than yourself or doing cleaning jobs to make ends meet. Walter in particular has big dreams of achieving financial success through his own efforts by opening a liquor store, yet these dreams and the reality of their lives create massive conflict in their marriage, that as Mama recognises, threaten to "drive away" Ruth. Note how they argue in Act One, when Walter asks Ruth to ask Mama for the money needed to start his business:
Honey, you never say nothing new. I listen to you every day, every night and every morning, and you never say nothing new. (Shrugging) So you would rather be Mr. Arnold than be his chauffeur. So--I would rather be living in Buckingham Palace.
However, in spite of appearances, it is clear that they do genuinely love each other, and fortunately, at the end of the story, Walter's decision to stand up to Lindner and refuse his cash offer shows that the family is working together now to face their problems head on rather than trying to tear itself apart by trying to fight their own individual corners.