yeah,, 2300 brand new, and between 1500-1800 ebay prices for used. While I will buy lens on ebay, I am agreeing in the camp that better to just pay the delta and get one with warranty/and zero wear. After all, these are expensive/complex machines, that can quickly become a total headache.
On the other hand,, uggg,,,, 2300 is a lot of money for such old design. I bought my first D700 on sale at 2100 dollars! and second one for 2250, so,, this camera has not dropped!. So,, if you spend 2300 dollars, and poof, they come out with a D600 with 16-24 Million sensor, video, Dual slots, better autofocus for 2200 dollars!
I have always waited until the new model comes out, and bought right away. It has been my experience that the price does not drop and often actually goes up.
Then, 3-4 years later, the new model comes out, sell the camera for only a few hundred less than purchase (because usually they are still in production because Nikon overlaps quite a bit), and upgrade.
The risk of course is that you get a dud (like the AF issue), but knock on wood, I have gone thru 5 models with no duds.
To answer your question, I gues if I could get a D700 for say 1500 dollars with say 30K shots, well,, ok.