If I understood your dealer's position correctly, the only justifiable reason why he/she was against putting a price down is because Nissan could, and most likely will, increase the MSRP in the coming months. The original deal was for these cars to be sold at MSRP - and not more. If he/she puts the current suggested price down, but then Nissan raises the their suggested price over the next few months, the dealer gets screwed, so why would they do that? In my opinion, the reason why the base model is such a good deal is because it is underpriced. Nissan wanted to sell the car for $30K. That means after burning off the preorders that were assumed to go to Z fanatics, the car had a buffer room of approx. $3K to bump the price up, but still be able to say they sold the car for the advertised price bracket. The original pricing scheme was designed more for the fans who were willing to purchase this car sight unseen. Once the market catches up, and people are able to test drive the Z, allowing them to be more pragmatic about it's quality versus the competition, the price will be raised to more accurately reflect demand and it's categorical market.

As for additional costs, that's always a bunch of dealer garbage, and should be fought tooth and nail to be waived.