If an item up for bid is running out of time, a soft close ensures that everyone who wants to gets the opportunity to put in an offer. For example, if you're trying to buy a luxury watch and place a bid in the last couple minutes of a live auction, another minute or so will automatically be added to the bidding time to allow for anyone else to bid higher than you. This prevents people from placing bids at the very last second and closing an item before someone else gets the chance. It also helps guarantee that the seller is able to get the highest dollar amount possible for the item they are selling.