There's a nice haunted-house moment at the end where the motel, no longer haunted, suddenly starts appearing as the decrepit, condemned building that it actually is, full of mold and water damage; it's essentially been held in stasis since the original murders.

That is good and, yes, could have mirrored nicely with the discovery of the body of the murderer, no longer a mysterious, potentially still active entity but a dude who has very definitely been dead in a barn for the last forty years.

The convenient envelope full of cash feels left over from someone who missed the point of Psycho.