To be fair, hosting a mafia game is far, far, FAR less time-consuming than an IOT (actually, depending on the complexity, it might not be quite that large a difference, but still a lot less time).
For example, I basically spend ~30 minutes 2/3 days either tallying/calculating night actions and writing the update. Of course, that's in a game where the majority of players are vanilla townies, but still.