It tapered off at the end because of three things: The mafia was gone, I wasn't pushing to make each day interesting at this point, and the weekend. See, once the mafia was done, the game became a formulaic "Vote Pale thrice, pick a player to kill." game, rather than one where people attack each other. If I had killed off all the inactive townies, it might have been interesting, though, since the only players left then would be some awesome players.
I also want to say there was one townie that really blew me out of the water, as far as public communications, go, and that was Arbok. He knew what was going on, guessed patterns, and connected dots few others did, and the whole time, people half suspected him of being mafia because of it. It was pretty interesting.