Great point, NTTP!
That's extremely true for all types of engineering -- who would want to be a civil engineer in a rural area when you could make 3x or more as a software engineer in an urban area (or remote)?
But I think it's probably true for all jobs -- if they say "there's a need!" then it's because the pay isn't the least bit worth it for the combination of 1) difficult work and 2) expensive education.
For example:
Nurses -- starting salary $60,000/year -- 4 year Bachelor's @ ~$100,000 in student debt
Physical Therapists -- starting salary $60,000/year -- 4 year Bachelor's + 3 year DPT @ ~$200,000 in student debt
Yeah, I'm not sure who wants to work 3 x 12 hours being legally responsible for the life of your patients with no nursing assistants (nursing techs) for the entire floor. Similarly, I usually worked 50+ hours in the office (add costuming and commuting time to that) as a physical therapist, often treating 3x patients every hour with or with 1 physical therapist tech.
(Techs are typically near-minimum-wage employees with no formal education in the field, other than the on-the-job training they get at work.)
Anyway, if you're interested in the Gervais principle thing, here are 2 links:
https://www.ribbonfarm.com/2009/10/07/the-gervais-principle-or-the-office-according-to-the-office/
Thanks again!