As long as you don't dig with it or throw it into stumps it should hold it's value. By "value" I'm speaking merely from it's purchase price.
Labor and materials get more expensive over time.
Sprints hold their value or appreciate more reliability than even normal production disco'ed ones
Those two factors make me believe the knife should stay about where you probably bought it at. Even if you take a small hit from extensive use, say 30% over half a decade (which is probably just scratching that knife's life expectancy
) your effectively paying $8 a year to rent it.
More likely a well treated Para2 sprint will be quite rare in the future in any condition let alone new-in-box so over a couple years even you will make money selling it used.
The big one for me is if you want to buy it, use it, and try to sell it in 3-6 months there could be a problem in recouping all of your money. Still, imho the hit isn't worth staring at the knife and never using it. Just my opinion from a "functional collector" perspective.
Side-Note: Buying at the top of the market changes all of this. There are probably some people with CF S90v Para2's they paid $300ish for. No clue at that game.