alt Hacker News> They have a built in "sniping bot" - by allowing you to type your highest price, and it will auto-bid for you until that price.
With ubid, you also had the feature of letting it bid to your highest price. Yet they still extended the auction if someone outbid your highest price.
That seems like a good bit of psychology as it accommodates both people with the mental fortitude to type in their genuine max bid in the first place, and also people who don't really know what they're willing to bid until they see somebody else bid higher.