The Household Bills
The McCaugheys had to trim their grocery budget significantly because it was quite costly to run a household with ten people. Keeping up with the day-to-day household needs drove their living costs significantly higher than the average American household.
They invested in two of everything to maximize efficiency and effectiveness. That means that they had two of each appliance, including two dryers, two sinks, and two washers. It got the household chores done faster and reduced the strain on each device, given the sheer amount of laundry and piled dishes handled at their residence.