For me personally, as a mum of 4, and with a hubby who works away mon-fri, we were actually only slightly worse off with me NOT working, than having taken a salon job (I applied for a couple after being made redundant in Jan). The "flexible" hours, and pretty dismal hourly rates would mean that after paying out for "flexible" child care, I would be lucky to have enough left over to pay my petrol and car insurance! I have always worked, and always paid for nurseries & childminders (no family close by) but have always had the wage to justify doing so.
But thats how my mobile business was born, I love that i can work it around my kids, only pay for child care if its justified, and long-term, it will undoubtedly be a lot more profitable, and as much as I love what I do - I will not do it for free!