Have you ever considered that maybe the product you're making is just not that world-changing for any sane developer to work consecutive overtime for? If you asked me to work 80+ hours to cure cancer sure, but to sacrifice my life to build cute iPhone apps? Nope.
I was conflicted about what you were saying because on one hand you seem to be moderating yourself after making an extreme statement, but then this statement clarified it for me.
Not sure if you realize it, but as an employer if YOU have to ask someone to work extra for you, there are all kinds of problems here. It probably means - you treat maybe unknowingly your reports one level below you and you demand they work for you and not with you. It also probably points to a lack of leading by example. If people see you sweating, reasonable people who are interested and feel valued and believe in your goal and mission will help you out and not leave you out in the cold.
So under no healthy situation you should be asking anyone to work for 80 hours. Hire the right people and then get out of their way.
