I can understand international frustrations on these type of "events", but please...don't forget the US receives a plethora of "charity auctions" that only ship within the US region and at times those auctions actually detect of whether a bidder is bidding within the US Internets!
So yeah, it's a shame it won't maximise potential profits/bidders, but I'm sure they have legal reasons for these things!? But you know there are ways around this
May I remind you guys from the US of the 'Marty McFly's Back To The Future Shoe Auction' from 2011.
