Mercedes nursed a special grievance - the grievance of sex. She was pretty and soft, and had been chivalrously treated all her days. But the present treatment by her husband and brother was everything save chivalrous. It was her custom to be helpless. They complained. Upon which impeachment of what to her was her most essential sex pregorative, she made their lives unendurable.
It's nice to have a lot of money, but you know, you don't want to keep it around forever. I prefer buying things. Otherwise, it's a little like saving sex for your old age.