Solid gold advice here.
For example in mobile games industry most of the cost is marketing and development costs are usually a fraction of what a company spends. Some percent more or less of it don't matter much for the company.
Even if development cost is a major cost in another industry, no investor will board the ship with such tight margins. Nothing is on stake that much as it seems from where you stand. I don't believe continuous crunch is necessary (if it is necessary at all).
If business owners can learn to manage business with 60 hours a week they can learn to do that 40 hours a week too. We are human after all and we survived till this day by learning how to manage limited resources better. Don't take over someone else's responsibilities.
If I ever employ developers in the future I'm planning to lock the doors and the take down the git server after business hours.
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