It strikes me that Montauk still has more than enough material to finish the series. For example, we could have:
"Episode 21: Threatening to Sue the Client",
"Episode 22: Too many cunts threatening to ruin me has left me with, take the money and run with it [sic]."
It would probably be a lot different than the earlier bits but not necessarily any less entertaining. And let's see Rory link that shit to his personal Vimeo, right?