I think it was pretty nice of you to use a linear scale. If a company wanted that much more of my time I would have quoted them a premium (just as an hourly employee might make overtime in such a situation).
And that does not even consider that my free time is very limited. If I have say 2h of completely free time everyday (24 hours minus work, commute, chores, gym, household crap, etc) and I need to work just 1 hour per day longer, then that cuts my free time per day in half. That is HUGE. You better pay me a lot for that.
But you lose out if you instead want to do 2 years on 2 years off, or if your one-year employer doesn't want you to work July to June, or if your year-off plans don't work July to June, or any number of more complicated scenarios. My point stands that the system isn't designed to support this kind of irregular high-income work.