An engineer making $150k working 60 hour weeks is making $5/hr less than an engineer earning $100k working 36 hour weeks. The latter is literally earning more _for their time_ working half as much for 2/3 the salary.
The hourly rate of an engineer earning $250k for 60 hour weeks is the same as an engineer earning $150k for 36 hour weeks.
The difference of 14 hours a week is 30 1/3 days/year. Some folks are willing to trade an extra month of their time per year from the prime years of their life for money, but not me. It should be a choice, not an expectation.
Maybe your perspective is different because you're a founder, but I get the feeling I wouldn't want to work for your company.