Well, I would certainly look at seeing what aid you apply for - 5 kids is quite a lot, and daycare is expensive. That said, we ALL (well, I would venture to say at least most of us) want to stay home with our kids - whether we have 1, 5 or more. If everyone who wanted to stay home with their kids turned to the government to help fund that desire, well, our aid system would collapse. It's just not reasonable, or fair really, to expect the American work force, which often includes working mothers who have no other choice, to comfortably fund those who just want to stay at home to raise their kids (wouldn't we ALL, if given the choice). I'm not trying to be harsh, I totally support your desire to stay home with your kids, I'm just giving you some food for thought while making this decision and deciding if this is the way you want to do it. Many mothers in the workforce have to stay there for insurance purposes, or just the need to increase the family income (assuming it is a two adult household). The trick is to do so in a way that maximizes your time with your family. Do you have the option of working a late or night shift? Do you have the option of working weekends, or otherwise opposite days from your husband's schedule?
I work both nights AND weekends. I'd love not to work, but it just isn't reasonable for my family. I would say that it certainly isn't the "most" fun, and often we don't have just an overabundance of free family time as usually either one of us is sleeping or working, but I get to spend all week with my kids, and my husband gets to reconnect with them and be more active in their lives on the weekend. We try to maximize all of our commonly shared time to make the most of it, and we do just fine and everyone is happy. :)
Another thing you might consider is working FROM home during the kids' naps and whatnot. I know there are others, but WorkingSolutions.com is a great company that both my best friend and my husband has worked with in the past, so I know it is legit. In short they are subcontractors for companies like Office Depot and hotels.com and you dial into their network using your home phone and computer and you perform call center like stuff for them (placing order, making reservations, etc) and you get paid by the talk minute, with a garunteed minimum each hour (so you don't suffer if it is slow).
Anyway, I have to run so *I* can take a nap so I can go to work tonight! I hope this has given you some things to think about! Good luck and I know that whatever is best for you and your family will be what happens (it almost always does!!)!