[brunes]

You seem to underestimate the burden of moving.

People have spouses, children, families, responsibilities. Not everyone can just pick up and move. Also, not everyone wants to move - some are very happy in a given location for various tangible reasons.

It is so trivial now for companies to source talent from anywhere on the globe that the days of employees negotiating salary based on location are pretty much over. You are competing at a global level now.