[crdoconnor]

>The problem is with egos, Employee A might view themselves as more valuable to the company than Employee B and vice versa.

In which case after finding out they leave and if it turns out they're not all that valuable they mainly just end up screwing themselves.

I'm not sure why any employer would consider this a problem.

An underpaid employee leaving and getting a better job though - sure, that's a problem.