When I get drunk, I also lose track of time and enjoy myself quite a bit. If I were an alcoholic, that doesn't mean its right. Trust me, im all for enjoying work, but this startup culture mentality of: "outwork the other guy 16 hours a day and have nothing else" is getting out of hand.
data would actually be really interesting. take a survey of early startup employees and entrepreneurs. in the meantime, if you spend enough time around the industry culture, you know this is a problem.