This is something I didn't really understand when I worked outside the home - when you stay home with your kids, home becomes your workplace. You get zero time off unless you are in bed ill - the dishes and laundry just keep appearing and its definitely YOUR JOB. You might get some help with it, but its still YOUR JOB. Saturday rolls around and your husband kicks back in front of the TV - and you might get a more relaxing day, but chances are you are the one getting meals in front of everyone, and cleaning up after them. My husband and both kids home this last week - WAY more work than I do when my husband is at work and my daughter is at school and I "just" keep house and homeschool my son. When I worked, a vacation at home was more than sufficient - it pulled me away from the workplace. Now that I'm home - this IS my workplace, I need to leave it. And it doesn't need to be Disney (in fact, currently I'm not that big on Disney as a vacation spot, there are better places for our family), but it does have to be somewhere that I don't look at the bathroom and remember I have painting it on my to do list.
The other thing I didn't realize - I'd like to pick up a few hours, but it really isn't conducive. I'm homeschooling my son because he's hit difficult teen years where he's made some poor decisions and requires a little more supervision - so I can't leave him for four hours. When my husband is home to supervise him, it would be nice if we saw each other - and when my daughter is home, its nice to see her as well. I need a lot of flexibility for my husband, he travels. Working even casual hours would, for someone who has kids that need supervision, mean finding drop in child care, or spending less time with your spouse. My spouse would gladly eat rice and beans a few times a week in exchange for spending more time with me. After all, he married me to spend more time with me, not to eat six oz of meat every night.
If drop in child care were EASY, like my mother lived close, I'd probably pick up a few hours and let her watch my son - not for extra money, but to get out of the house and do something other than remember I SHOULD paint the bathroom, deal with homeschooling my son, do MORE dishes and laundry, and surf the web. But finding someone to take kids on casual hours isn't easy. My sister is a nurse who works a sort of strange part time job. She's the nursing administrator at a hospital, but its a REALLY SMALL hospital, so they only need her part time. But sometimes she is needed on short notice. It means she has paid for full time child care since her kids were born. She doesn't use it, but it was the only deal she could get for the drop in hours she needs. Fortunately, in a REALLY SMALL town, full time daycare was pretty cheap and flexible - but most people don't have the luxury of easy child care.
There is another reason I do frugal meals - because I know my kids aren't going to step out into their parents' socio economic class - and there will be years where knowing how to make meals out of dried beans, rice, corn meal, vegetables, and be able to stretch a chicken for four meals will be an important skill set. And if they stick their noses up at it and think that meals need to come with a double sized serving of chicken, fish or beef in the middle of the plate, with a potato - I'll be really disappointed. They don't need that diet for their health (and it is possible to eat healthy and frugally) and they don't need it for their future.