I think Chris is using the forum to ensure that his problems are publicised to the widest possible audience, way beyond the forum members. Given that he set up this site that we all enjoy so much, perhaps we should indulge him on this.
Judging by 350Z residuals I'd say that you'd just cover the final payment if you sold it at the end but I wouldn't bank on getting much profit. If you just give the car back you walk away with no money.
IMHO PCP-type deals only work if the final payment is equivalent to the value at the end of the term plus your deposit. You can then sell the car and still have money to start a PCP on another.