Rule No.1, there is no such thing as a bargin on ebay anymore.
The bidding at the last second is more than likely as a result of sites such as justsnipe.com.
I must admit, I've used it once or twice
and it's as simple as you puting the auction number in and the 'snipe' amount and it does the rest, it'll automatically put your bid in at literally the last second. Not fair, but it's the way most auctions are won these days