Its pretty much going to entirely depend on airframe lifespan, isn't it? Private jets aren't really a collectors item the way old prop craft or warplanes are, and there's so few people who could afford to unironically collect them that they're not going to pay a premium to compete with each other over extremely bog standard aircraft like this. The only people who'd be interested in buying it would be aircraft museums who'd 'buy' it for a token price and expect you to write the rest of the value off as a tax credit as a donation to their non-profit arm, or people actually just operating private jets. The latter are just gonna pay based on the expected remaining service life, not some nebulous collectors value. Their clients are gonna want the newest jet that is comfy as fuck, not a 30 year old reno project, so they're not gonna pay out a premium.