Last time I checked, just a couple of years ago, Wikimedia's CEO makes ~$350k / year which seems extremely reasonable compared to most CEOs in the USA. It was ~2.5x my salary when I worked at the foundation. Typical CEO salary multipliers (as compared to typical staff salary) are far far greater in the USA.

From my experience, and I worked there for 7 years, Wikimedia pays below average for the industry, though the benefit package is absolutely top-notch.