I think this is a myth. It's really a matter of lifestyle (I don't use the word sacrafice because that implies giving something up and it's really a conscious CHOICE that has more to do with personal values and priorities). I'm not talking about single parents here, although I know single parents who find jobs or businesses they can work around their kids school schedule and some who even homeschool. We aren't rich and neither are most of our friends. During most of my kids' growing up we'd probably be considered lower middle class. For most of their childhood we lived in a crappy little house with a gigantic yard (boys need room to run off all that energy)...even so we could barely scrape together enough for the down payment. But it was cozy and it was ours and they never had to know what it was like to play with a Nintendo instead of a mommy or spend their time at daycare with 30 other kids who didn't want to be there anymore than they did.
Play clothes came from thrift stores and most of the time we only had one car. But really, our lives, ALL OUR LIVES, not just our boys, were less stressful than most of our neighbors who both worked and were constantly having to coordinate schedules for work, daycare and their kids' activities. Peace, contentment and closeness are more than adequate trade-offs for the things we couldn't buy. My 6' tall 20 year old has a black belt in Karate and would rather be hunting than practically anything else, lives at home while he's going to college and he still gives me hugs and kisses and says prayers with me before he goes to bed and still holds my hand in the parking lot while we're walking into a store like he did when he was young (I joke with him that in this day and age, people are going to get the wrong idea...he says he could care less what other people think).
This same son, who has had to deal with his first real rabid feminists...they teach at his school...and I were talking about this last night. It's not that he doesn't know any strong, independent women, since we homeschooled he knows plenty of them. However, these women he just doesn't get. He thinks they've become exactly what they were supposed to be fightning against. They feel like they've been put down, "victimized" by men their whole lives, but they spend most of their time putting down men. If women are supposed to be "better" you'd think they wouldn't resort to the same tactics they accuse their "oppressors" of using. He also said he thinks they don't want real "equality", they really want to be better than or above men. He thought it was ironic that they are trying to become exactly what they hate.