Actually, no. In those games, its the lowest unique bid. check out http://www.bidster.com/ . This way, if more than one person choose the lowest bid, then those cancel eachother out, and the next lowest, but non-duplicated bid wins. There's a large number of these sites out there actually, but none-the-less a very profitable business. Might be less of a lottery though, because one could claim its a game of skill.

Good point, I forgot to mention that it is a timed silent auction.