"Princes don't work however bureaucrats do in Mayvos. Princes are independent. The Dread Emperor forbids fighting among them, and aside from that, as I understand it, issues very little in the way of orders--certainly now, but reputedly also for at least several millennia."
"So Princes don't fight, and that means, nobody can make them do anything, not even an alliance of other Princes."
"I don't actually remember offhand how Prince Purplegray got assigned to oversee the Farm. I think he might have fucked up a few thousand years ago and the Dread Emperor told him this was his punishment?"
"There may be a Prince out there who would like authority over the Farm, but it would have to be one of the non-noble Princes who dwell in Capital because nobody's going to leave a planet for that. And then there's the question of who even decides who gets the Farm, if there's more than one applicant, or no applicants at all, and the Dread Emperor does not conveniently hand down a decision about it."