I'm not a SAHM but I've been suprised recently by at least three mums,who have children in my DS's class at school(year2),who have given up work to be SAHM.In each case their youngest is my DS's age(6/7yo),each have two children with the other being older,so have all their children in school.
I've spoken to these women and all commented that,they just got fed up of rushing around all the time and trying to juggle, childcare,work,homework,childrens hobbies in evenings,etc.
Personally,I think there is enough to be doing in the house(at least there is in mine),and running around after the children to make it a full time job.It proberbly makes for a far more relaxed and calm home life,for the whole family,especially the DH,if the wife choses to be a SAHM.
I know if we could afford for me not to work(I work 3 days),DH would love to have me at home.I would also love to be a SAHM.
We have twin DSs 7yo and I have a stepDD 11yo,I do all the housework,laundry,gardening,DIY,etc,as I only work 3 days I'm not rushing as much as if I was F/T,but I'm still kept pretty busy,I'd love to have more time to do things.
After all,being a wife and mother used to be a full time job,till women all got taken in by the bloody womens libers!!!