Has anyone actually ever seen a pink slip?
People who are not obsessed with the company and the product should not be there.
Things are going to go wrong and as a start-up the only serious advantage you have (apart, we hope, from an innovative product) is that you can provide superior service because you are willing to pull out all the stops to fix problems, night or day, weekends, statutory holidays, family vacations, whenever.
If you have ever used the phrase work-life balance in a serious tone then do your spouses, partners, employees, and managers a favour and stay away from start-ups.