That is just another factor of the desirability of the job that impacts how much one needs to pay to find enough employees. Other factors also involve where th

That is just another factor of the desirability of the job that impacts how much one needs to pay to find enough employees. Other factors also involve where the jobs are located (if you are in the middle of nowhere, even with much cheaper costs of living, you may need to pay significantly more to convince someone with the desired skills to move to the middle of nowhere) and the long term potential (really good work that only lasts for a short time may not be worth moving for unless it pays significantly more).