An online auction could also implement an "extensible" auction to mimic the GGG auction (just as they offer a "buy-it-now" option), where the end time is extended by, say, an hour after the last bid. That is, sniping would re-open a new window for competitive bids. To ensure such an auction concludes in a reasonable time, the minimum bid increment could also slowly be raised, and/or the extensibility could be limited to, say, a set number of hours or days (so you wouldn't necessarily know in advance whether your last-minute bid would extend the auction).