One of my 5e campaigns GMs is like that. He took over after we finished Keep on the Shadowfell (sometime in 2009 probably), and has never given up the reins. He just said "I like to be in charge"; and the rest of us were like "ok"Huh. I have never encountered that. I would love to play more than I do, but I'm the person willing to GM, so GM I do.
I'm in other games with rotating GMs, and that's fine too - always nice to sit on both sides of the screen (usually metaphorical) with the same people