If you can bill $200 per hour for 75 hours a week for a year, though, maybe you'd be willing to do that for a year or so just in order to never have to do it, or any other work, ever again.

Of course, if the client actually has to pay $200 per hour you're present, it's exceedingly likely that the overtime culture will stop overnight. It's obvious that it isn't working already, once the company actually pays for it as well, it is bound to stop.