Yeah, that's not how human psychology works. You didn't have managers earning $400,000K+ at the Wikimedia Foundation then. :)
Edit: Looking at the video with the monkeys two posts up: there could still be a point to it, if we look at the total earnings and total work of a person, instead of just looking at wikipedia: an editor who earns 100k with their day job and donates work to wikipedia can still feel it is unfair when wikipedia management earns four times as much.