I'll never understand it

Maybe I'm missing something here, but I don't understand the macho businessman attitude. The whole "I worked later than you did last night" thing. What is with people who'd rather be holed up in an office at 10 at night, as opposed to being home relaxing and enjoying themselves. I shouldn't say I don't totally get it, I mean, I understand enjoying what you do, and taking pride in your work and your passions, (and if your work is your passion, I envy you), but seriously how is working 12 hours a day worth it when it costs you your relationships, with your family and kids, and when it sucks so much out of you that you can't even enjoy what little waking time you have outside of work?

Typical lines I hear regularly:

Taking a half day today? (said when someone is leaving at 6:00 after working 8 hours)

Don't complain to me, I was here 'til 10:30 last night

I was working this weekend, where were you? (in response to a "How was your weekend?" question)

And a new one, in reply to the "taking a half day?" comment

Noooo. I'm just getting warmed up! (said while i'm watching the clock wondering how much lnger til the end of the day)