That's really what's kept me at my job.
Sometimes it gets really wonky, especially when there is a crunch time. Or, lately I've been cleaning up AWS accounts for other companies and handed unreliable AWS instances that page me at bad hours.
I have to be pretty aggressive about counting how much I am working and not working more than what I've agreed to work.
But to be honest, I'm quite a bit more productive than some folks at the business (my boss is ostensibly selling my labor for ~$170/hr, at least). I'm pretty sure if my boss wanted to raise my pay by 30% to bring me up to 40h, I wouldn't be 30% more productive.
I'm occasionally not stoked on things like how much vacation time I get or my pay in general (it's low for my position, but high is you account for the reduced hours).
But on the whole, I do so much other crap in my life that I really don;t wanna sell another 10h of my time a week. And holy hell I never want to work in an office that doesn't have a mixing console and a bunch of vintage mics.