Marek,
Many a time I have been sniped (because I can't outbid myself) and would gladly have paid a higher price but was never afforded the opportunity.
The key to winning, whether you snipe or not, is to bid the maximum amount you're willing to pay. You HAD the opportunity to pay a higher price all the time, you just didn't bid accordingly. Changing the rules isn't going to help you in those circumstances, but bidding your MAX amount will.
Scot,
Extending bidding like you have in a real-world auction does achieve the real market value because every bidder has a chance to get their max bid on the table and not game the last 10 seconds of the auction.
Academically, I think snipers probably bid much higher than people think, because it's a contest they have to win. 2 or 3 snipers jumping in can increase the final price very substantially because they are bidding their max's to win.
It's not a real auction. At a real auction, sure, people will stick around and keep bidding until they're satisfied enough to stop. On ebay... a computer? Honestly, after it gets extended one time, I have better things to do than play games. People who need it absolutely "today" are novices anyway, because most things are going to turn up again given time. People snipe because they've learned a bit, and I don't think they'll continue playing a game if the rules were changed. I believe it's offered on a couple of other sites, none of which has ever pulled considerable market share because of extended bidding.
That's just IMHO as a collector. It sounds great, but I don't think it would have the positive effect that people hope for. I, for one, would probably just not bother looking anymore. As I said, I don't have time for games. When I walk to the computer to bid at a certain time, it is my expectation to win and pay for it within 5 minutes.
Again, I think there's more productive things to go for.... having ebay add another 100,000 lines of script in an effort to control bidding doesn't really strike me as the way to go.
Leo