It doesn't change because upper management is all in the "cult", and there's no incentive to lower salaries. If all programmers (or any other profession) were in charge of their own salaries, I'd suspect something similar happening with people rewarding each other more and more compensation while pointing at other companies to justify it.
If the current CEO, whom from the outside is not doing a great job, is not willing to. You find a different CEO. I am not convinced that no one wants to do the job for $500k instead of $2.5m. Whether that person would be good/bad/worse is pure speculation, but it's not like organizations are taking the chance.
they'd probably have to have at least a negative $2m impact before it mattered right?
revenue on its own may not even be the best measure, if the revenue comes via methods that conflict with the larger ideology. I don't know if Mozilla has that conflict with itself or not.
Your point is accurate though, and I've held the same views for a while now. This sort of thinking would seem to dictate that the next Mozilla CEO will need to come in at around $2.5m - that's been defined as the floor now. Regardless of how well that person executes, they've got that base. And... you can't really judge them after 3 months. You'd need to give them a year to make a 'real' assessment... and you've just spent that money on someone, regardless of outcome.