There aren't any I can really think of since "scary" usually equates to thrilling or very attention-grabbing action. Games with more of an ambiance or environmental basis on horror would fit your criteria. Maybe sandbox games like Don't Starve or Subnautica? Sunless Sea and Sunless Skies can both be very narrative and story-heavy but can also give you hours and hours of simply grinding for resources in a dark, macabre world. Hell, even Dark Souls is really bleak but allows you to play it without any real narrative attention.
>That's assuming it sells equal copies every year with isn't true, the majority of a game's sales come within the launch year with some notable exceptions.
One of those notable exceptions for the original Amnesia being the let's play/scare cam craze that occurred as a result
of the game. With how games increase in scope and production costs year over year and in comparison to Amnesia: The Dark Descent being such a historic success most games that try to emulate it barely capture a fraction of its fame or profit, even newer games by the exact same developer. It's shocking there's no multiplayer Amnesia or some tie-in with Dead By Daylight yet.