Very interesting thread, which comes at a time I'm at a huge crossroads in my life (youngest has started school, I've been a SAHM since eldest was born).
It has worked really well having DH work while I stay home - his career has taken off and we find ourselves comfortable financially (more than we'd ever hoped). If we'd both worked part-time or he'd not been able to travel and work the hours he has, we'd not be where we are, financially speaking. I have mostly enjoyed being home, I didn't earn a great deal beforehand, so I'd have been earning £0 after childcare once DC2 arrived, and the logistics with sick children and school holidays would probably have been complicated (no family nearby).
While I agree it can seem that I am "dependent" financially on DH, he very much sees us as a team, doing what we each do best, and we are all happy with the current set-up. While I'm confident we'll stay together forever (have weathered a fair few storms in nearly 20 years together), he jokes that he couldn't afford to divorce me! As the earner he would have to support two households, and he's a very fair person anyway, and really values my role.
When we met he already earned twice what I did. He currently earns about five times more than my last full-time salary.
We have overpayed into pensions, mortgage and have very good life insurance, in case something terrible happens to either of us. So things don't feel too precarious.
He is encouraging me to work now, more for my own satisfaction and enjoyment, than for the money. I am incredibly lucky to have no immediate financial pressure to work, because my earning potential IS low, especially if I want to work from home and/or part-time. Because the fact is that I DO want to continue to be the main carer. My children are still quite young (infant school).
So yes we have a very traditional set-up, but it works for us and my children know that I had a job before and I will work again, so I don't consider that I'm a poor role model.
The SAHMs I know are mostly very involved with school and after-school clubs, voluntary work and studying, and lead interesting lives. Many of them will have made huge financial sacrifice to stay home, and I have no doubt it was not a decision taken lightly. Many have started businesses or changed their line of work, by choice. I do think being out of the workplace for a while, for whatever reason, forces you to take stock. Personally I value being able to participate in the local community, chat to elderly neighbours, run playgroups, that sort of thing. My not working also enabled us to have a spell overseas with my husband's job, and we consider this to have been an enriching cultural experience for the whole family.
I have several friends who have managed to share domestic and childcare roles and wage-earning with their DHs, and I admire them. They have a truly egalitarian set-up. But that depends on having equal earning potential, or short commute, or flexible working hours, not counting the proximity of grandparents who can step in when all the logistics fall apart!