A coworker was telling me about a Sci-Fi book he read in the 80s but couldn't remember the title.
He vaguely remembers there being humans on another planet who would randomly choose 5 leaders. He said that 5 other people decided they wanted to rule so they murdered the random ones and impersonated them so they could rule instead.
These people could also donate blood and tissue to avoid working so nobody on the planet works. The revenue of the planet seemed to come from these donations. It is a very overpopulated planet and takes place primarily in an urban setting.
They also can go to a "carnival" and ride the rides as a game. If they win the game, they get to keep riding, if they lose, they die.
He said it had a dystopian feel and was a part of a Sci-Fi book subscription service. He read it in English.