Nikon will perform no warranty service on a grey market camera, but they will certainly service it at a price. Or are you telling me that if I buy a camera while on a trip to Japan and bring it back to the US I would never be able to service it? We've been through this before, and if memory serves the gamble is with warranty service only - which means they would not cover the exchange of D600 for D610 bodies that some here have experienced had the original D600 been foreign market (but they did replace one for me that I purchased used here in the US). So yes, there is a risk, and I do not recommend it whole-heartedly. But there are some willing to take the risk.
As for the seller, yes the numbers mean there are 2 items left of an original 64 listed with 62 sold. A review of his feedback shows similar sales going back a good while, and the negatives seem mostly to do with shipping delays and the seller's desire to sell add'l warranty service. For me, Brooklyn is 90 minutes away and I'd be happy to take a trip in to pick it up personally - or pay a visit with said product if something wasn't up to snuff, so even the negatives are minor and run at well under 1% of the over ten thousand transactions.
Again, I'm not recommending or endorsing anyone, but know that I wouldn't have posted a link to what I considered to be a potential unscrupulous seller (at least as eBay standards go) in the first place if I wouldn't have been comfortable ordering from them myself.