Assuming the developer can get paid a 40-hour salary for working 40 hours a week elsewhere instead of 70-90 hour weeks plus 24/7 on-call, the developer is clear

Assuming the developer can get paid a 40-hour salary for working 40 hours a week elsewhere instead of 70-90 hour weeks plus 24/7 on-call, the developer is clearly capable of earning more dollars per hour of work.