[kapitti]

Considering one of the first rounds of money that a startup takes is usually friends & family, I would suggest not sacrificing them.

You can maintain a healthy social life, or marriage, or keeping in touch with family, and still succeed. Read Balsamiq's story: http://www.balsamiq.com/blog/?p=79 - It's not the largest sample size, but he's not the only one doing it.

Your family and friends should support you. My wife understands the life, she understands that when I'm in "the zone" to put my dinner in the fridge and I'll reheat it later. I gave my wife 12 hours notice that 3 other rails hackers would be in our house for a weekend for RailsRumble - she went out and bought groceries and cooked for us. When the internet went down that weekend, her father came to our rescue and opened his lawfirm's office for us to work from - the end result, we won RailsRumble 2008 - and we did it with the support of our families.

The fact that I have obligations (Mortgage, Student Loans, Car Payment) keeps me focused.