Larry, are you saying that you're going to lose a bet on the hockey game and the card is payment for that bet?
I've followed auctions only to see them end early. I've also tried to get sellers to end auctions early in an attempt to buy a card because that very same tactic was used by someone else to get a card that I wanted. It's gotten to the point where you do what you can to get what you want (within reason - I wouldn't kill somebody over a card, well in most cases I wouldn't
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I have to figure that the card belongs to the seller and that they can do whatever they want with it. If they chose to put it in the BST and on ebay and they sell it on the BST then they can cancel the ebay auction. If that makes a potential buyer/bidder unhappy then they can chose to not bid on that sellers auctions in the future.
The person that said that the card isn't mine until it's in my possession is correct. You can pay for a card but it isn't really yours until you have your hands on it.
I've heard people complain that if there's a bid on the card then the seller should run the course of the auction - that's the sellers choice. I remember negotiating a price for a card on ebay (that had no bids) and by the time we settled on a price there was a bid on the card. The card was pulled and the person that placed a bid on it (a board member, way back when) was ticked off about it. Sorry about that, sometimes the timing just sucks.