With 15 people and 7.5 hour work days, saving each person just 30 minutes a day is cost equivalent to a permanent full time role. At 30 people, you need to save just 15 minutes. At 90 people, 5 minutes.

And that is without considering that a full time role would keep doing more work than that singular time saving, or the decreased operational cost from failures in manual process execution.

Just because the jobs seem menial to you does not exclude it from bringing great value to an employer.

(Above numbers are subject to crude linear extrapolation, but are sufficient to make the point.)