Other than the fact that it's still sitting on the dealer's lot, is there anything unusual about it like an odd color combination? Recognizing it's generally a buyer's market right now, if it were me I'd offer (set an anchor) quite low and see what the dealer counters with. Your thought to start at $72K seems reasonable to me. (You could start in the 60s, 69K if you wanted to be aggressive. You'll never pay less than your initial offer!) As a final negotiating chip if the warranty is running - and I assume it is - I would ask that the car be CPO'd. It's a way for the dealer to provide value to you in terms of an extra couple of years on the warranty at a modest cost to himself given the low mileage, ie, it will need nothing.
Just my opinion of course.
Thanks, the build seems pretty standard to me. From VIN Analytics:
Prod Month: 2018-09-29
Price: $97,220.00
Exterior: Night Blue Metallic
Interior: Standard Interior in Black Leather/Alcantara® with
BASE 718 Cayman GTS
030 PASM Sport Suspension (Lowered 20 mm)
250 7-speed Porsche Doppelkupplung (PDK)
457 Lane Change Assist (LCA)
489 Heated Multifunction Steering Wheel
519 PORSCHE Logo in Satin Black
541 Seat ventilation
858 Steering Wheel in Leather
9VL Bose® Surround Sound System
9WT Apple CarPlay® incl. Siri®
GG Standard Interior in Black Leather/Alcantara® with Leather Seat Centers
N5 Night Blue Metallic
P07 Adaptive Sport Seats Plus (18-way) with Memory Package
P40 Navigation including Porsche Connect
P9I Premium Package Plus i.c.w. Adaptive Sport Seats Plus (18-way)
QH1 Voice Control i.c.w. Connected Navigation