I think we're in a silly place now, where we're both vociferously arguing a point we probably agree on. You have to do a good job, yes. You can't phone it in. But you don't have to work routine 70 hour weeks. You don't owe that to anyone.
[1] "One of the most pervasive myths of startup life is that it has to be all consuming. That unless you can give your business all your thoughts and hours, you don’t deserve success. You are unworthy of the startup call. This myth neatly identifies those fit for mission: Young, without obligations, and few if any extra-curricular interests. The perfect cannon fodder for 10:1 VC long shots." http://37signals.com/svn/posts/3106-all-or-something
[2] "Startups Are Hard. So Work More, Cry Less, And Quit All The Whining" http://uncrunched.com/2011/11/27/startups-are-hard-so-work-m...
I agree strongly on the 70-hour weeks. I'm working on a book about startup misconceptions, and one of the chapters is titled, "Working lots of hours means you're making progress." Interested in being interviewed for it? Stories from actual founders are what will really persuade people.
Details here: https://www.quora.com/William-Pietri/Startup-Misconceptions-...