I'm a SAHM, but I know many many people who would love to be SAHMs and can't afford it. Like, really can't afford it -- not that they could give up a car, or live in a yuckier house, or whatever. I'm very very happy to have the opportunity to be an SAHM, but I always feel duty-bound to insert into these discussions that it's not merely a choice for many people.
I really enjoyed working, and expected that I would stay home only until my daughter started school full-time, and that either dh or I would be home when she'd come home. I also expected that I would have only one child, and I'm currently wrestling with that. I feel strongly about staying home until that point, so another kid stretches my time not working from 5 years to 8 or more... not sure what I think about that yet.