She has the typical mobility issues that only come up when gainful employment is at hand. Sure, they can take care of themselves and make 5 trips a day to get fast food, but sitting at a desk 8 hours a day? Nah. And do you really think the husband wouldn't be doing all of that anyway? Her idea of taking care of the house is sending a few letters and logging on to pay a few bills every month, all the actual work chores would go to the guy.