Some folks want the most they can get for the "least amount of effort" required. "I could have been a manager but I don't want all the headaches that come with it. I just want to do my job and go home."
Those statements are fairly common among most workers.
Higher pay usually means more responsibilities, working beyond 5PM, and proactively looking for ways better the company and increase profits.
Lots of people are content with leaving at 5PM and getting a 3% raise. That actually may be fine if a person never gets married, has no children, or doesn't go on lavish spending sprees...
(Assuming they never get laid off.)
However the reality is circumstances always change and when they do there is usually a financial cost associated with them.
In past eras there were jobs considered "stepping stone" jobs in which people worked while they were in college or pursuing their dream career.
Today there is a push to make grocery baggers, paperboy delivery, and fast food server salaries "living/middle class wages" to support buying homes, cars, investing, and raising a family.