Yep!!!!

Lets imagine that overtime gets you 50% more productive output.

If your business plan requires 50% more output and you cannot afford to just hire 50% more people then it sounds like you are running a business with very tight margins.

Plenty of other things could raise your staff costs 50% and put you out of business. How about the higher staff turnover from burning out staff? Now you're paying your recruitment consultant more in fees and the extra cost of training and on-boarding new staff.

In case an employee has little overhead, get 2 "part-timers" and let them each work 30-40 hours per week. And cut all other distractions where possible.