Yeah, a rather extreme example, and of course we hope they are being sufficiently well compensated in experience, though we know that's not always the case.

As another example, there's the people working 70 hour weeks across 3 jobs - no one of those is paying what's necessary to sustain the employee.

Moreover, if you're okay with high turnover, there may be people willing to work for you unsustainably for a time just to lower their burn rate.