The dollar auction is usually run as an experiment in game theory classes and works a little differently from the penny auction sites. In the latter, all of your bids at any point are a sunk cost.
I saw an ad for something like that a while ago, but realized that you couldn't sell an ipad for $0.56 if you weren't getting the full retail plus a margin from somewhere. Thankfully I never got into it.
[0] https://en.wikipedia.org/wiki/Dollar_auction