A fair question but I don't see them as mutually exclusive options. You can absolutely work 70 hours a week and have a great relationship with your family. I also work from the house so it's not quite the same as someone working for others in an office they spend 2 hours a day commuting to. We're not talking about skipping your kids altogether, we're talking about spending an extra 20 hours a week working for just 5-7 years so that you'll be able to spend the next 30 years any way you want to (I assume, since you're on this board, you're a 50-hour-a-week person to start).

My kids are the most important thing to me and, in life, you make trade-offs: bigger house or nicer car? Get my teeth fixed or go to the Bahamas? Work 50 hours a week doing something in which I have little control for 50 years or work my ass off for 5-7 years so that I have control for the next 45 years? That's how I see it.