Still not a scam. People are obviously willing to pay that much since they are bidding on it. I bet a lot of them are probably outside of the U.S. since eBay is one of the easiest ways to get one in that case.
eBay has a rule about pre-orders. I think you can't offer the product for sale more than a month in advance or something like that. In any case, this appears to be an entirely legit eBay item.
Only in the US. That auction calls out "worldwide" shipping. I certainly wouldn't open myself up to the risk of shipping to countries with known fraudulant chargebacks, but hey, supply and demand make it tempting for others.