Book value means nothing when it comes to the ZHPs. I have yet to find anyone( KBB, Edmunds, TruCar) actually tracking values for the cars specifically. So book does not reflect the market. Having bought two low mileage ZHPs this year plus 2 close friends who also bought ZHPs in the last 4 months, I think I have a very good idea where the market really is. A well maintained ZHP in excellent condition will bring $15k no problem. So the right combo of seller, car and buyer could definitely bring $16k - $18k.
The problem is many sellers think they have an excellent car but they don't. By excellent I mean mint. No mechanical issues, current maintenance, preventive maintenance all with OE parts, documentation on all maintenance and often other documentation about the car plus minimal signs of wear (inside and out). Cars like this listed for under $16k sell fast. Under $14k and they sell in hours.
I'm not saying this car qualifies. Four owners isn't a show stopper but probably means no records, especially since the car is at a dealer now, most dealers throw out that stuff citing privacy issues. Auto transmission reduces value, so does the black rims. The Dinan upgrades are nice a bonus but do nothing to increase valve. But if this is the same car that was listed a year ago then something is definitely fishy.
Note TruCar actually had values broken out by ZHP 12 months ago and I felt it was pretty accurate. I came across it when I was searching for my first car. But recently I checked it for a buddy and it now lumps all 330s together. It states there is no significant difference in price based upon option packages.
t.