There needs to be more transparency / data around this to really reach any legitimate conclusions.

Salaries alone are only marginally useful, it's also important to know what stage the company is in (earlier the stage, less the salary, yes or no? Would love to test that b/c that's our intuition). Its also important to know what industry. How much fundraising vs # of employees, how does that ratio effect the CEO salary. Also, equity %. Do founders who make more get less equity than sweat equity CEO's who take no salary? So many questions!