Entitlement Mentality with a capital M

 There are many job titles that pay well, some exceptionally well. One of these starts with a capital M. Many with such job titles expect to be paid very well, or at least as well as others with the same job title with a capital M. If M1 is getting so much, M2, M3...must also be getting the same because their job titles all carries a capital M in front. Should this be so?

In the corporate world, not everyone with a job title with a capital M is paid the same. The reasons are simple. Not all jobs are the same even if they carry a job title with a capital M. Some are bigger jobs, bigger responsibilities, bigger, harder and more important decision making, etc etc. In the corporate world, not everyone with a capital M job title expects to be paid the same. It is commonsense, not rocket science.

Why should there be such a mentality that when one carries a job title with a capital M one can demand to be paid the same as everyone with the same job title that has a capital M in front? Every job is different and everyone can see the difference without even having to think much. Some jobs are very demanding, some jobs are very cushy to the point that the incumbent could have hardly anything important to do, or nothing to do, and has to think very hard on what to do.

What is the root cause of this Entitlement Mentality?  Oops, it is not Entitlement Mentality. They just deserved to be paid well or else they will not want the job, or they could get a better paying job elsewhere? Or there are special reasons to pay them obscenely well?