Labug, I don't think Shaky meant any comment on the value of SAHMs. The - very valid - point was that many WAHs resent their SAH spouses - rightly or wrongly.
My ex definitely did - even though his salary was adequate for our needs, and I had an illness which interfered with my ability to pursue my career for a number of years, and once I was better, our daughter developed a serious eating disorder and needed me home.
Still, my ex had a chip on his shoulder about being the sole breadwinner - and he definitely didn't value the very hard work I did as a homemaker (I've been in the workforce - I'll take going to a job anyday over raising three kids! Don't get me wrong, I love 'em and it was great to be able to be home with them - but it is DEFINITELY the harder job!)
