Relative to other luxury goods purchased with the intent to store them as investment vehicles, like fine wine and rare art, I suppose GECs aren't hard to come by.
But you're barking up the wrong tree with that rhetorical tactic, because none of my GECs would even sell for their new price. I sharpen them, regrind them, experiment with geometry because they're so easy to sharpen, cover them in coarse stone scratches from hasty sharpening, file the kicks and recut notches, oil the wood, etc. My knives all depreciate in value, except to me.