I keep seeing this line as if people think CEOs shouldn't exist or aren't worth their compensation. That is incredibly incorrect thinking. Good CEOs and bad CEOs are two different creatures and lead companies to very different places. Just like you want to pay more for highly skilled developers, you want executive pay to be competitive to hire someone capable of the job.
Put it this way, you could pay me $1m in annual compensation to be Mozilla's CEO (sounds like a good deal?), but I am sure I will be the most terrible CEO in the history of the company and cannot even run the company properly at a daily basis.