When was the last time you saw a clean, unmolested 240SX on the road? Are there any left? Did they ever exist at all? Who can say.
I don’t think these got riced as much as Civics because they were marketed more strongly to secretaries.
That’s a guess. Not sure at all. But of all the cars out there that fade away while still in plain sight, it’s been my experience that a 240SX is even more invisible than a Corolla.