Just look at other cars, e.g. Panamera. A new loaded S with air suspension, leather and super audio may go 120k, a lightly equipped base may go 85k, 3 years later, the base sells (by dealer) for mid 60s and the loaded S sells for low to mid 70s... Oh the trade-ins are likely 10k lower than the dealer's asking prices.
So over 3 years, the base depreciated 30k (85-55) and loaded S depreciated over 50k... this is true for all premium brands, Mercedes, Audi, BMW, you name it, not just Porsche. We see the same trends for P85s...
Some years later when say used 90Ds are going for 60k, P90D, however equipped, will go for 70k, if that. L mode will probably be worth close to nothing, 1-2k max on the resale market... just like that air suspension + PASM + sports chrono (performance options that improves actually both handling, normal day driving, and launch speed) will bring virtually nothing for that loaded Panamera S on resale...