How would you measure the performance, given that it is a non-profit? Which self-respecting CEO who is actually good would go for such a deal? I think it is important to understand that the employees of a non-profit are allowed to earn a proper salary.

I think $7 million is too much for the CEO of a non-profit, but $100K would be too low. You can see that there are plenty of CEOs making more than $1 million: https://www.charitywatch.org/nonprofit-compensation-packages...