I agree that the C08 Harpy is a niche product and certainly not a high volume seller for the company but, if they didn't make $ on it, I'm still certain that they would have stopped making it long ago.
As an aside, it's also not clear (at least on SpydieWiki) that the C08 Harpy has been in continuous production since 1987; at least not named the Harpy.
In 1993-94, Spyderco produced the C21 Merlin but then they renumbered it the C08 Merlin (not the Harpy) but then again later they dropped the Merlin name and resumed calling it the C08 Harpy.
The timeline for all of these changes, as reported on SpydieWiki is uncertain and very confusing.
However, I do note that there are those who collect the C08 Merlin as opposed to the C08 Harpy.
Absent the box, how they can tell the differences (which apparently are very subtle) between the the C08 Merlin and C08 Harpy, I do not know and do not care to learn.
I'm just happy to know that I have an authentic C21S Merlin (fully serrated FRN w/the plastic molded clip) that I purchased myself back in 1993-94 for SD.
LOL!