Because job difficulty and job pay aren’t correlated under capitalism.

The easiest job is to own assets. Not manage assets. Own them. Which is to say get your name on a title of a sufficiently large asset, and the money just rolls in while you sleep in bed. You sleep, your asset works.

Owners need lieutenants to look after their assets. That’s what a CEO is.

So why are CEOs so highly paid? Because if you do not, they will embezzle (steal) money from your asset since they control every aspect of your asset’s daily functioning! So you need to cut the CEO in on the grift of being a big asset owner.